feat(build): add RELEASE_VERSION argument to be able to pass release version via env

.github/workflows/release-docker.yml

@@ -9,23 +9,24 @@ jobs:
   docker:
     runs-on: ubuntu-latest
     steps:
-      -
-        name: Login to GHCR
+      - name: Git describe
+        id: ghd
+        uses: proudust/gh-describe@v2
+      - name: Login to GHCR
         uses: docker/login-action@v3
         with:
           registry: ghcr.io
           username: ${{ github.repository_owner }}
           password: ${{ secrets.GITHUB_TOKEN }}
-      -
-        name: Set up QEMU
+      - name: Set up QEMU
         uses: docker/setup-qemu-action@v3
-      -
-        name: Set up Docker Buildx
+      - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
-      -
-        name: Build and push
+      - name: Build and push
         uses: docker/build-push-action@v6
         with:
           platforms: linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64/v8
           push: true
-          tags: ghcr.io/go-vikunja/vikunja:unstable
+          tags: ghcr.io/go-vikunja/vikunja:unstable
+          build-args: |
+            RELEASE_VERSION:${{ steps.ghd.outputs.describe }}