CI: build container when the version is a clean git tag

.forgejo/workflows/build.yaml

@@ -13,6 +13,8 @@ jobs:
     runs-on: container
     steps:
       - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
 
       - uses: pnpm/action-setup@v4
         name: Install pnpm
@@ -31,17 +33,22 @@ jobs:
       - name: Build package (transpile ts => js)
         run: ng build
 
-      - name: Git unshallow - get all history from Git to get the tag for the computation of the version
+      #- name: Git unshallow - get all history from Git to get the tag for the computation of the version
-        if: ${{ inputs.build }}
+      #  if: ${{ inputs.build }}
-        run: git pull --unshallow
+      #  run: git pull --unshallow
 
       - name: Get the version from git
-        if: ${{ inputs.build }}
         id: version
         run: echo "version=$(git describe --dirty --tags)" >> $GITHUB_OUTPUT
 
+      - name: Check if the container should be built
+        id: builder
+        env:
+          builder: ${{ inputs.build || !contains(steps.version.output.version, '-') }}
+        run: echo $builder
+
       - name: Build container
-        if: ${{ inputs.build }}
+        if: ${{ steps.builder.builder }}
         uses: actions/buildah-build@v1
         with:
           image: treetrail-frontend
@@ -50,13 +57,13 @@ jobs:
             ./Containerfile
 
       - name: Workaround for bug of podman-login
-        if: ${{ inputs.build }}
+        if: ${{ steps.builder.builder }}
         run: |
           mkdir -p $HOME/.docker
           echo "{ \"auths\": {} }" > $HOME/.docker/config.json
 
       - name: Log in to container registry (with another workaround)
-        if: ${{ inputs.build }}
+        if: ${{ steps.builder.builder }}
         uses: actions/podman-login@v1
         with:
           registry: ${{ vars.REGISTRY }}
@@ -65,7 +72,7 @@ jobs:
           auth_file_path: /tmp/auth.json
 
       - uses: actions/push-to-registry@v2
-        if: ${{ inputs.build }}
+        if: ${{ steps.builder.builder }}
         with:
           registry: "docker://${{ vars.REGISTRY }}"
           image: treetrail-frontend