fix(release): add missing ARG RELEASE_VERSION

The ARG RELEASE_VERSION set in the build-env image does not propagate
to the images that follow. As a result the value of the version label
is always empty.

This should have been caught by the test in the CI but although it
notified the problem in the output, it did not fail. Upgrade to the
forgejo-build-publish version that fixes this false positive.

.forgejo/testdata/build-release/Dockerfile

@@ -1,4 +1,6 @@
 FROM code.forgejo.org/oci/alpine:3.19
 ARG RELEASE_VERSION=unkown
+LABEL maintainer="contact@forgejo.org" \
+      org.opencontainers.image.version="${RELEASE_VERSION}"
 RUN mkdir -p /app/gitea
 RUN ( echo '#!/bin/sh' ; echo "echo forgejo v$RELEASE_VERSION" ) > /app/gitea/gitea ; chmod +x /app/gitea/gitea

.forgejo/workflows/build-release.yml

@@ -159,7 +159,7 @@ jobs:
 
       - name: build container & release
         if: ${{ secrets.TOKEN != '' }}
-        uses: https://code.forgejo.org/forgejo/forgejo-build-publish/build@v5.1
+        uses: https://code.forgejo.org/forgejo/forgejo-build-publish/build@v5.1.1
         with:
           forgejo: "${{ env.GITHUB_SERVER_URL }}"
           owner: "${{ env.GITHUB_REPOSITORY_OWNER }}"
@@ -178,7 +178,7 @@ jobs:
 
       - name: build rootless container
         if: ${{ secrets.TOKEN != '' }}
-        uses: https://code.forgejo.org/forgejo/forgejo-build-publish/build@v5.1
+        uses: https://code.forgejo.org/forgejo/forgejo-build-publish/build@v5.1.1
         with:
           forgejo: "${{ env.GITHUB_SERVER_URL }}"
           owner: "${{ env.GITHUB_REPOSITORY_OWNER }}"

Dockerfile

@@ -52,6 +52,7 @@ RUN chmod 755 /tmp/local/usr/bin/entrypoint \
 RUN chmod 644 /go/src/code.gitea.io/gitea/contrib/autocompletion/bash_autocomplete
 
 FROM docker.io/library/alpine:3.19
+ARG RELEASE_VERSION
 LABEL maintainer="contact@forgejo.org" \
       org.opencontainers.image.authors="Forgejo" \
       org.opencontainers.image.url="https://forgejo.org" \