Fix build workflow.

.github/workflows/cd.yml

@@ -9,6 +9,10 @@ permissions:
   id-token: write
   packages: write
 
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
 jobs:
   container:
     name: Build Docker image
@@ -17,6 +21,10 @@ jobs:
       - uses: actions/checkout@v4
         with:
           fetch-depth: 0
+      - name: Get tag or version
+        id: gitvars
+        run: |
+          echo ::set-output name=version::${GITHUB_REF#refs/tags/}
       - name: Install cosign
         uses: sigstore/[email protected]
         with:
@@ -29,17 +37,13 @@ jobs:
           registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
-      - name: Get branch name
-        shell: bash
-        run: echo "##[set-output name=git_branch;]$(echo ${GITHUB_REF##*/})"
-        id: extract_branch
       - name: Extract Docker metadata
         id: meta
         uses: docker/[email protected]
         with:
           images: "${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}"
           tags: |
-            type=raw,value=${{ steps.extract_branch.outputs.git_branch }}
+            type=raw,value=${{ steps.gitvars.outputs.version }}
       - name: Build and push Docker image
         id: build-and-push
         uses: docker/[email protected]