werf.yaml: check mounts

[juev]

In all werf files, check that if the image is using BASE_GOLANG_*, then there are options:

mount:
- fromPath: ~/go-pkg-cache
  to: /go/pkg
- from: tmp_dir
  to: /root/.cache/go-build

[alexey-gavrilov-flant]

mount:
{{- include "go mount build" $ }}

{{- define "go mount build" }}
- from: tmp_dir
  to: /go/pkg
- from: tmp_dir
  to: /root/.cache/go-build
{{- end }}

[alexey-gavrilov-flant]

https://werf.io/docs/v2/usage/build/stapel/mounts.html