ci(docker): Replace LABEL Dockerfile commands with labels: (GHA) (#551)

This cleanup patch sets labels in a more uniform way, and contributes
to earn several (small) layers in the resulting images.

Related: docker/build-push-action#863
Close #545

Author: erikmd

.github/workflows/deploy-master.yml

@@ -39,8 +39,12 @@ jobs:
           push: true
           tags: "ocamlsf/learn-ocaml:master"
           labels: |
+            org.opencontainers.image.title=learn-ocaml
+            org.opencontainers.image.description=learn-ocaml app manager
+            org.opencontainers.image.url=https://ocaml-sf.org/
+            org.opencontainers.image.vendor=The OCaml Software Foundation
             org.opencontainers.image.created=${{ steps.prep.outputs.created }}
-            org.opencontainers.image.source=${{ github.repositoryUrl }}
+            org.opencontainers.image.source=${{ github.server_url }}${{ github.repository }}
             org.opencontainers.image.version=master
             org.opencontainers.image.revision=${{ github.sha }}
   push_client:
@@ -76,8 +80,12 @@ jobs:
           target: client
           tags: "ocamlsf/learn-ocaml-client:master"
           labels: |
+            org.opencontainers.image.title=learn-ocaml-client
+            org.opencontainers.image.description=learn-ocaml command-line client
+            org.opencontainers.image.url=https://ocaml-sf.org/
+            org.opencontainers.image.vendor=The OCaml Software Foundation
             org.opencontainers.image.created=${{ steps.prep.outputs.created }}
-            org.opencontainers.image.source=${{ github.repositoryUrl }}
+            org.opencontainers.image.source=${{ github.server_url }}${{ github.repository }}
             org.opencontainers.image.version=master
             org.opencontainers.image.revision=${{ github.sha }}
   push_emacs_client:
@@ -116,7 +124,11 @@ jobs:
             version=master
           tags: "ocamlsf/emacs-learn-ocaml-client:master"
           labels: |
+            org.opencontainers.image.title=learn-ocaml-client with emacs
+            org.opencontainers.image.description=learn-ocaml command-line client with emacs
+            org.opencontainers.image.url=https://ocaml-sf.org/
+            org.opencontainers.image.vendor=The OCaml Software Foundation
             org.opencontainers.image.created=${{ steps.prep.outputs.created }}
-            org.opencontainers.image.source=${{ github.repositoryUrl }}
+            org.opencontainers.image.source=${{ github.server_url }}${{ github.repository }}
             org.opencontainers.image.version=master
             org.opencontainers.image.revision=${{ github.sha }}

.github/workflows/release.yml

@@ -160,8 +160,12 @@ jobs:
             ocamlsf/learn-ocaml:latest
             ocamlsf/learn-ocaml:${{ steps.tag.outputs.tag }}
           labels: |
+            org.opencontainers.image.title=learn-ocaml
+            org.opencontainers.image.description=learn-ocaml app manager
+            org.opencontainers.image.url=https://ocaml-sf.org/
+            org.opencontainers.image.vendor=The OCaml Software Foundation
             org.opencontainers.image.created=${{ steps.prep.outputs.created }}
-            org.opencontainers.image.source=${{ github.repositoryUrl }}
+            org.opencontainers.image.source=${{ github.server_url }}${{ github.repository }}
             org.opencontainers.image.version=${{ steps.tag.outputs.tag }}
             org.opencontainers.image.revision=${{ github.sha }}
   push_client:
@@ -203,8 +207,12 @@ jobs:
             ocamlsf/learn-ocaml-client:latest
             ocamlsf/learn-ocaml-client:${{ steps.tag.outputs.tag }}
           labels: |
+            org.opencontainers.image.title=learn-ocaml-client
+            org.opencontainers.image.description=learn-ocaml command-line client
+            org.opencontainers.image.url=https://ocaml-sf.org/
+            org.opencontainers.image.vendor=The OCaml Software Foundation
             org.opencontainers.image.created=${{ steps.prep.outputs.created }}
-            org.opencontainers.image.source=${{ github.repositoryUrl }}
+            org.opencontainers.image.source=${{ github.server_url }}${{ github.repository }}
             org.opencontainers.image.version=${{ steps.tag.outputs.tag }}
             org.opencontainers.image.revision=${{ github.sha }}
   push_emacs_client:
@@ -250,7 +258,11 @@ jobs:
             ocamlsf/emacs-learn-ocaml-client:latest
             ocamlsf/emacs-learn-ocaml-client:${{ steps.tag.outputs.tag }}
           labels: |
+            org.opencontainers.image.title=learn-ocaml-client with emacs
+            org.opencontainers.image.description=learn-ocaml command-line client with emacs
+            org.opencontainers.image.url=https://ocaml-sf.org/
+            org.opencontainers.image.vendor=The OCaml Software Foundation
             org.opencontainers.image.created=${{ steps.prep.outputs.created }}
-            org.opencontainers.image.source=${{ github.repositoryUrl }}
+            org.opencontainers.image.source=${{ github.server_url }}${{ github.repository }}
             org.opencontainers.image.version=${{ steps.tag.outputs.tag }}
             org.opencontainers.image.revision=${{ github.sha }}

Dockerfile

@@ -44,11 +44,6 @@ COPY --from=compilation /home/opam/install-prefix/bin/learn-ocaml-client /usr/bi
 
 ENTRYPOINT ["dumb-init","/usr/bin/learn-ocaml-client"]
 
-LABEL org.opencontainers.image.title="learn-ocaml-client"
-LABEL org.opencontainers.image.description="learn-ocaml command-line client"
-LABEL org.opencontainers.image.url="https://ocaml-sf.org/"
-LABEL org.opencontainers.image.vendor="The OCaml Software Foundation"
-
 
 FROM alpine:3.13 as program
 
@@ -74,8 +69,3 @@ COPY --from=compilation "$opam_switch/lib/ocaml" "$opam_switch/lib/ocaml/"
 
 ENTRYPOINT ["dumb-init","/usr/bin/learn-ocaml","--sync-dir=/sync","--repo=/repository"]
 CMD ["build","serve"]
-
-LABEL org.opencontainers.image.title="learn-ocaml"
-LABEL org.opencontainers.image.description="learn-ocaml app manager"
-LABEL org.opencontainers.image.url="https://ocaml-sf.org/"
-LABEL org.opencontainers.image.vendor="The OCaml Software Foundation"