Update circleci config to add build against external libzstd

Author: dopuskh3

.circleci/config.yml

@@ -1,7 +1,6 @@
 version: 2
-
 jobs:
-  "golang-1.14":
+  golang-1.14:
     docker:
       - image: circleci/golang:1.14
     steps:
@@ -11,7 +10,7 @@ jobs:
       - run: 'go build'
       - run: 'PAYLOAD=`pwd`/mr go test -v'
       - run: 'PAYLOAD=`pwd`/mr go test -bench .'
-  "golang-1.15":
+  golang-1.15:
     docker:
       - image: circleci/golang:1.15
     steps:
@@ -21,7 +20,7 @@ jobs:
       - run: 'go build'
       - run: 'PAYLOAD=`pwd`/mr go test -v'
       - run: 'PAYLOAD=`pwd`/mr go test -bench .'
-  "golang-latest":
+  golang-latest:
     docker:
       - image: circleci/golang:latest
     steps:
@@ -31,7 +30,19 @@ jobs:
       - run: 'go build'
       - run: 'PAYLOAD=`pwd`/mr go test -v'
       - run: 'PAYLOAD=`pwd`/mr go test -bench .'
-  "golang-efence":
+  golang-latest-external-libzstd:
+    docker:
+      - image: circleci/golang:latest
+    steps:
+      - checkout
+      - run: 'sudo apt update'
+      - run: 'sudo apt install libzstd-dev'
+      - run: 'wget https://github.com/DataDog/zstd/files/2246767/mr.zip'
+      - run: 'unzip mr.zip'
+      - run: 'go build -tags external_libzstd'
+      - run: 'PAYLOAD=`pwd`/mr go test -tags external_libzstd -v'
+      - run: 'PAYLOAD=`pwd`/mr go test -tags external_libzstd -bench .'
+  golang-efence:
     resource_class: xlarge
     docker:
       - image: circleci/golang:latest
@@ -41,7 +52,19 @@ jobs:
       - run: 'unzip mr.zip'
       - run: 'go build'
       - run: 'PAYLOAD=`pwd`/mr GODEBUG=efence=1 go test -v'
-  "golang-zstd-legacy-support":
+  golang-efence-external-libzstd:
+    resource_class: xlarge
+    docker:
+      - image: circleci/golang:latest
+    steps:
+      - checkout
+      - run: 'sudo apt update'
+      - run: 'sudo apt install libzstd-dev'
+      - run: 'wget https://github.com/DataDog/zstd/files/2246767/mr.zip'
+      - run: 'unzip mr.zip'
+      - run: 'go build -tags external_libzstd'
+      - run: 'PAYLOAD=`pwd`/mr GODEBUG=efence=1 go test -tags external_libzstd -v'
+  golang-zstd-legacy-support:
     docker:
       - image: circleci/golang:latest
     steps:
@@ -50,7 +73,7 @@ jobs:
       - run: 'unzip mr.zip'
       - run: 'CGO_CFLAGS="-DZSTD_LEGACY_SUPPORT=1" go build'
       - run: 'PAYLOAD=`pwd`/mr CGO_CFLAGS="-DZSTD_LEGACY_SUPPORT=1" go test -v'
-  "golang-i386":
+  golang-i386:
     docker:
       - image: 32bit/ubuntu:16.04
     steps:
@@ -64,6 +87,8 @@ workflows:
       - "golang-1.14"
       - "golang-1.15"
       - "golang-latest"
+      - "golang-latest-external-libzstd"
       - "golang-efence"
+      - "golang-efence-external-libzstd"
       - "golang-i386"
       - "golang-zstd-legacy-support"