T5400: initialize OPAM environment where it's really needed

[c-po]

Change summary

Instead of trying to fix - what we call - "Schroedingers build environment" in the outside world calling this package build, we should rather fix the Makefile/build system..

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, renaming)
• Refactoring (no functional changes)
• Migration from an old Vyatta component to vyos-1x, please link to related PR inside obsoleted component
• Other (please describe):

Related Task(s)

• https://vyos.dev/T5400

Related PR(s)

• Docker: T5400: do not initialize OPAM environment at all vyos-build#928
• T5400: initialize OPAM environment where it's really needed libvyosconfig#25

How to test / Smoketest result

+ gcc -shared  -o '_build/libvyosconfig.so'  '-L/opt/opam/4.14.2/lib/containers/monomorphic' '-L/opt/opam/4.14.2/lib/either' '-L/opt/opam/4.14.2/lib/containers' '-L/opt/opam/4.14.2/lib/fileutils' '-L/opt/opam/4.14.2/lib/menhirLib' '-L/opt/opam/4.14.2/lib/pcre' '-L/opt/opam/4.14.2/lib/ppx_deriving/runtime' '-L/opt/opam/4.14.2/lib/ppx_deriving_yojson/runtime' '-L/opt/opam/4.14.2/lib/xml-light' '-L/opt/opam/4.14.2/lib/seq' '-L/opt/opam/4.14.2/lib/yojson' '-L/opt/opam/4.14.2/lib/vyos1x-config' '-L/opt/opam/4.14.2/lib/re' '-L/opt/opam/4.14.2/lib/bigarray-compat' '-L/opt/opam/4.14.2/lib/stdlib-shims' '-L/opt/opam/4.14.2/lib/integers' '-L/opt/opam/4.14.2/lib/ctypes' '-L/opt/opam/4.14.2/lib/ctypes/stubs' '-L/opt/opam/4.14.2/lib/ctypes-foreign' '-L/opt/opam/4.14.2/lib/ctypes/foreign' '-L/opt/opam/4.14.2/lib/ocaml/threads' '-L/opt/opam/4.14.2/lib/ocaml' -Wl,-soname,libvyosconfig.so.0 '/tmp/camlstartup50a566.o' '_build/lib/apply_bindings.o' '_build/generated/vyosconfig_bindings.o' '_build/lib/bindings.o' '/opt/opam/4.14.2/lib/ctypes-foreign/ctypes_foreign.a' '/opt/opam/4.14.2/lib/ctypes/stubs/ctypes_stubs.a' '/opt/opam/4.14.2/lib/ocaml/str.a' '/opt/opam/4.14.2/lib/ctypes/ctypes.a' '/opt/opam/4.14.2/lib/integers/integers.a' '/opt/opam/4.14.2/lib/bigarray-compat/bigarray_compat.a' '/opt/opam/4.14.2/lib/re/re.a' '/opt/opam/4.14.2/lib/vyos1x-config/vyos1x.a' '/opt/opam/4.14.2/lib/yojson/yojson.a' '/opt/opam/4.14.2/lib/xml-light/xml_light.a' '/opt/opam/4.14.2/lib/ppx_deriving_yojson/runtime/ppx_deriving_yojson_runtime.a' '/opt/opam/4.14.2/lib/ppx_deriving/runtime/ppx_deriving_runtime.a' '/opt/opam/4.14.2/lib/pcre/pcre.a' '/opt/opam/4.14.2/lib/menhirLib/menhirLib.a' '/opt/opam/4.14.2/lib/fileutils/fileutils.a' '/opt/opam/4.14.2/lib/containers/containers.a' '/opt/opam/4.14.2/lib/either/either.a' '/opt/opam/4.14.2/lib/containers/monomorphic/containers_monomorphic.a' '/opt/opam/4.14.2/lib/ocaml/threads/threads.a' '/opt/opam/4.14.2/lib/ocaml/unix.a' '/opt/opam/4.14.2/lib/ocaml/stdlib.a' '-lctypes_foreign_stubs' '-lffi' '-Wl,--no-as-needed' '-lcamlstr' '-lctypes_stubs' '-lintegers_stubs' '-lvyos1x_stubs' '-lpcre_stubs' '-lpcre' '-lthreadsnat' '-lpthread' '-lunix' '_build/stub/init.o' '_build/generated/vyosconfig.o' '/opt/opam/4.14.2/lib/ocaml/libasmrun_pic.a' -lm
make[3]: Leaving directory '/tmp/libvyosconfig'
Generating build/interface-definitions/container.xml from interface-definitions/container.xml.in
Generating build/interface-definitions/firewall.xml from interface-definitions/firewall.xml.in
Generating build/interface-definitions/high-availability.xml from interface-definitions/high-availability.xml.in
Generating build/interface-definitions/interfaces_bonding.xml from interface-definitions/interfaces_bonding.xml.in
Generating build/interface-definitions/interfaces_bridge.xml from interface-definitions/interfaces_bridge.xml.in
Generating build/interface-definitions/interfaces_dummy.xml from interface-definitions/interfaces_dummy.xml.in
Generating build/interface-definitions/interfaces_ethernet.xml from interface-definitions/interfaces_ethernet.xml.in
Generating build/interface-definitions/interfaces_geneve.xml from interface-definitions/interfaces_geneve.xml.in
Generating build/interface-definitions/interfaces_input.xml from interface-definitions/interfaces_input.xml.in
Generating build/interface-definitions/interfaces_l2tpv3.xml from interface-definitions/interfaces_l2tpv3.xml.in
Generating build/interface-definitions/interfaces_loopback.xml from interface-definitions/interfaces_loopback.xml.in
Generating build/interface-definitions/interfaces_macsec.xml from interface-definitions/interfaces_macsec.xml.in

Checklist:

• I have read the CONTRIBUTING document
• I have linked this PR to one or more Phabricator Task(s)
• I have run the components SMOKETESTS if applicable
• My commit headlines contain a valid Task id
• My change requires a change to the documentation
• I have updated the documentation accordingly

[github-actions]

👍
No issues in PR Title / Commit Title

[github-actions]

CI integration 👍 passed!

Details

CI logs

• CLI Smoketests (no interfaces) 👍 passed
• CLI Smoketests (interfaces only) 👍 passed
• Config tests 👍 passed
• RAID1 tests 👍 passed
• TPM tests 👍 passed