CI: Fix version fetching in GH Actions.

Author: carlosperate

.github/workflows/release.yml

@@ -9,6 +9,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+      - name: Get the version
+        id: get_version
+        run: echo ::set-output name=VERSION::${GITHUB_REF/refs\/tags\//}
+        shell: bash
       - name: Login to GitHub Container Registry
         uses: docker/login-action@v1
         with:
@@ -19,17 +23,17 @@ jobs:
       - name: Build base image
         run: docker build -t ghcr.io/${{ github.repository_owner }}/ubit-toolchain:latest .
       - name: Tag same base image with the versioned tag
-        run: docker tag ghcr.io/${{ github.repository_owner }}/ubit-toolchain:latest ghcr.io/${{ github.repository_owner }}/ubit-toolchain:${{ github.ref }}
+        run: docker tag ghcr.io/${{ github.repository_owner }}/ubit-toolchain:latest ghcr.io/${{ github.repository_owner }}/ubit-toolchain:${{ steps.get_version.outputs.VERSION }}
       - name: Push base images to ghcr.io
         run: |
           docker push ghcr.io/${{ github.repository_owner }}/ubit-toolchain:latest
-          docker push ghcr.io/${{ github.repository_owner }}/ubit-toolchain:${{ github.ref }}
+          docker push ghcr.io/${{ github.repository_owner }}/ubit-toolchain:${{ steps.get_version.outputs.VERSION }}
 
       - name: Build codespaces image
         run: docker build -t ghcr.io/${{ github.repository_owner }}/devcontainer-ubit:latest .
       - name: Tag same codespaces image with the versioned tag
-        run: docker tag ghcr.io/${{ github.repository_owner }}/devcontainer-ubit:latest ghcr.io/${{ github.repository_owner }}/devcontainer-ubit:${{ github.ref }}
+        run: docker tag ghcr.io/${{ github.repository_owner }}/devcontainer-ubit:latest ghcr.io/${{ github.repository_owner }}/devcontainer-ubit:${{ steps.get_version.outputs.VERSION }}
       - name: Push codespaces images to ghcr.io
         run: |
           docker push ghcr.io/${{ github.repository_owner }}/devcontainer-ubit:latest
-          docker push ghcr.io/${{ github.repository_owner }}/devcontainer-ubit:${{ github.ref }}
+          docker push ghcr.io/${{ github.repository_owner }}/devcontainer-ubit:${{ steps.get_version.outputs.VERSION }}