Multiple CI and code fixes

[paskal]

• enable golangci-lint run for memory_store example
• fix detected errors in memory_store:

accessor/data.go:409:3  ineffassign  ineffectual assignment to `meta`
accessor/data.go:419:3  ineffassign  ineffectual assignment to `meta`

• fix runaway goroutine in TestRest_Shutdown
• add race_test option to Makefile
• fix multiple typos across the code

[paskal]

Yet uncaught (file operations?) data race

To reproduce, run cd backend/app and then go test -race -mod=vendor -timeout=60s -count 1 ./...

Discovered after fixing runaway goroutine in TestRest_Shutdown, as it was shadowing this problem.

I've tried to fix it by adding finished channel closing and waiting to Test_Main but it didn't resolve the problem and I didn't commit that change.

==================
WARNING: DATA RACE
Write at 0x0000026558a0 by goroutine 163:
  github.com/umputun/remark/backend/app/rest/api.startupT()
      /Users/dmitry/Documents/remark/backend/vendor/github.com/go-pkgz/lgr/interface.go:44 +0x10b
  github.com/umputun/remark/backend/app/rest/api.TestRest_Ping()
      /Users/dmitry/Documents/remark/backend/app/rest/api/rest_public_test.go:26 +0x50
  testing.tRunner()
      /usr/local/opt/go/libexec/src/testing/testing.go:909 +0x199

Previous read at 0x0000026558a0 by goroutine 221:
  github.com/umputun/remark/backend/app/store/image.(*FileSystem).Commit()
      /Users/dmitry/Documents/remark/backend/vendor/github.com/go-pkgz/lgr/interface.go:28 +0x94
  github.com/umputun/remark/backend/app/store/image.(*Service).Submit.func1.1()
      /Users/dmitry/Documents/remark/backend/app/store/image/image.go:77 +0x214

Goroutine 163 (running) created at:
  testing.(*T).Run()
      /usr/local/opt/go/libexec/src/testing/testing.go:960 +0x651
  testing.runTests.func1()
      /usr/local/opt/go/libexec/src/testing/testing.go:1202 +0xa6
  testing.tRunner()
      /usr/local/opt/go/libexec/src/testing/testing.go:909 +0x199
  testing.runTests()
      /usr/local/opt/go/libexec/src/testing/testing.go:1200 +0x521
  testing.(*M).Run()
      /usr/local/opt/go/libexec/src/testing/testing.go:1117 +0x2ff
  main.main()
      _testmain.go:214 +0x223

Goroutine 221 (running) created at:
  github.com/umputun/remark/backend/app/store/image.(*Service).Submit.func1()
      /Users/dmitry/Documents/remark/backend/app/store/image/image.go:69 +0x113
  sync.(*Once).doSlow()
      /usr/local/opt/go/libexec/src/sync/once.go:66 +0x100
  sync.(*Once).Do()
      /usr/local/opt/go/libexec/src/sync/once.go:57 +0x68
  github.com/umputun/remark/backend/app/store/image.(*Service).Submit()
      /Users/dmitry/Documents/remark/backend/app/store/image/image.go:65 +0x81
  github.com/umputun/remark/backend/app/store/service.(*DataStore).submitImages()
      /Users/dmitry/Documents/remark/backend/app/store/service/service.go:165 +0x143
  github.com/umputun/remark/backend/app/store/service.(*DataStore).Create()
      /Users/dmitry/Documents/remark/backend/app/store/service/service.go:105 +0x1c2
  github.com/umputun/remark/backend/app/rest/api.(*private).createCommentCtrl()
      /Users/dmitry/Documents/remark/backend/app/rest/api/rest_private.go:92 +0xc7a
  github.com/umputun/remark/backend/app/rest/api.(*private).createCommentCtrl-fm()
      /Users/dmitry/Documents/remark/backend/app/rest/api/rest_private.go:54 +0x5f
  net/http.HandlerFunc.ServeHTTP()
      /usr/local/opt/go/libexec/src/net/http/server.go:2007 +0x51
  github.com/go-pkgz/rest/logger.(*Middleware).Handler.func1()
      /Users/dmitry/Documents/remark/backend/vendor/github.com/go-pkgz/rest/logger/logger.go:123 +0x297
  net/http.HandlerFunc.ServeHTTP()
      /usr/local/opt/go/libexec/src/net/http/server.go:2007 +0x51
  github.com/go-chi/chi/middleware.NoCache.func1()
      /Users/dmitry/Documents/remark/backend/vendor/github.com/go-chi/chi/middleware/nocache.go:54 +0x39a
  net/http.HandlerFunc.ServeHTTP()
      /usr/local/opt/go/libexec/src/net/http/server.go:2007 +0x51
  github.com/umputun/remark/backend/app/rest/api.matchSiteID.func1()
      /Users/dmitry/Documents/remark/backend/app/rest/api/rest.go:542 +0x2ed
  net/http.HandlerFunc.ServeHTTP()
      /usr/local/opt/go/libexec/src/net/http/server.go:2007 +0x51
  github.com/go-pkgz/auth/middleware.(*Authenticator).auth.func2.1()
      /Users/dmitry/Documents/remark/backend/vendor/github.com/go-pkgz/auth/middleware/auth.go:79 +0xadd
  net/http.HandlerFunc.ServeHTTP()
      /usr/local/opt/go/libexec/src/net/http/server.go:2007 +0x51
  github.com/didip/tollbooth_chi.(*limiterWrapper).ServeHTTP()
      /Users/dmitry/Documents/remark/backend/vendor/github.com/didip/tollbooth_chi/tollbooth_chi.go:41 +0x46c
  github.com/go-chi/chi/middleware.Timeout.func1.1()
      /Users/dmitry/Documents/remark/backend/vendor/github.com/go-chi/chi/middleware/timeout.go:45 +0x2e4
  net/http.HandlerFunc.ServeHTTP()
      /usr/local/opt/go/libexec/src/net/http/server.go:2007 +0x51
  github.com/go-chi/chi.(*ChainHandler).ServeHTTP()
      /Users/dmitry/Documents/remark/backend/vendor/github.com/go-chi/chi/chain.go:31 +0x73
  github.com/go-chi/chi.(*Mux).routeHTTP()
      /Users/dmitry/Documents/remark/backend/vendor/github.com/go-chi/chi/mux.go:425 +0x3e4
  github.com/go-chi/chi.(*Mux).routeHTTP-fm()
      /Users/dmitry/Documents/remark/backend/vendor/github.com/go-chi/chi/mux.go:399 +0x5f
  net/http.HandlerFunc.ServeHTTP()
      /usr/local/opt/go/libexec/src/net/http/server.go:2007 +0x51
  github.com/go-chi/chi.(*Mux).ServeHTTP()
      /Users/dmitry/Documents/remark/backend/vendor/github.com/go-chi/chi/mux.go:70 +0xa0b
  github.com/go-chi/chi.(*Mux).Mount.func1()
      /Users/dmitry/Documents/remark/backend/vendor/github.com/go-chi/chi/mux.go:292 +0x1fc
  net/http.HandlerFunc.ServeHTTP()
      /usr/local/opt/go/libexec/src/net/http/server.go:2007 +0x51
  github.com/go-chi/chi.(*Mux).routeHTTP()
      /Users/dmitry/Documents/remark/backend/vendor/github.com/go-chi/chi/mux.go:425 +0x3e4
  github.com/go-chi/chi.(*Mux).routeHTTP-fm()
      /Users/dmitry/Documents/remark/backend/vendor/github.com/go-chi/chi/mux.go:399 +0x5f
  net/http.HandlerFunc.ServeHTTP()
      /usr/local/opt/go/libexec/src/net/http/server.go:2007 +0x51
  github.com/go-chi/cors.(*Cors).Handler.func1()
      /Users/dmitry/Documents/remark/backend/vendor/github.com/go-chi/cors/cors.go:199 +0x20f
  net/http.HandlerFunc.ServeHTTP()
      /usr/local/opt/go/libexec/src/net/http/server.go:2007 +0x51
  github.com/go-pkgz/rest.Ping.func1()
      /Users/dmitry/Documents/remark/backend/vendor/github.com/go-pkgz/rest/middleware.go:39 +0x2a4
  net/http.HandlerFunc.ServeHTTP()
      /usr/local/opt/go/libexec/src/net/http/server.go:2007 +0x51
  github.com/go-pkgz/rest.AppInfo.func1.1()
      /Users/dmitry/Documents/remark/backend/vendor/github.com/go-pkgz/rest/middleware.go:22 +0x45b
  net/http.HandlerFunc.ServeHTTP()
      /usr/local/opt/go/libexec/src/net/http/server.go:2007 +0x51
  github.com/go-pkgz/rest.Recoverer.func1.1()
      /Users/dmitry/Documents/remark/backend/vendor/github.com/go-pkgz/rest/middleware.go:55 +0xee
  net/http.HandlerFunc.ServeHTTP()
      /usr/local/opt/go/libexec/src/net/http/server.go:2007 +0x51
  github.com/go-chi/chi/middleware.RealIP.func1()
      /Users/dmitry/Documents/remark/backend/vendor/github.com/go-chi/chi/middleware/realip.go:34 +0x99
  net/http.HandlerFunc.ServeHTTP()
      /usr/local/opt/go/libexec/src/net/http/server.go:2007 +0x51
  github.com/go-chi/chi/middleware.(*throttler).ServeHTTP()
      /Users/dmitry/Documents/remark/backend/vendor/github.com/go-chi/chi/middleware/throttle.go:94 +0x4cc
  github.com/go-chi/chi.(*Mux).ServeHTTP()
      /Users/dmitry/Documents/remark/backend/vendor/github.com/go-chi/chi/mux.go:82 +0x642
  net/http.serverHandler.ServeHTTP()
      /usr/local/opt/go/libexec/src/net/http/server.go:2802 +0xce
  net/http.(*conn).serve()
      /usr/local/opt/go/libexec/src/net/http/server.go:1890 +0x837
==================