fix: correctly pass git commit to docker build

.gitea/workflows/build.yml

@@ -70,12 +70,7 @@ jobs:
           username: ${{ gitea.actor }}
           password: ${{ secrets.REGISTRY_TOKEN }}
 
-      # Step 8: Get the short commit SHA to use as an image tag.
-      - name: Get short commit hash
-        id: commit
-        run: echo "sha_short=$(echo ${{ gitea.sha }} | cut -c1-7)" >> $GITEA_OUTPUT
-
-      # Step 9: Build the Docker image and push it to the Gitea registry.
+      # Step 8: Build the Docker image and push it to the Gitea registry.
       # The image is tagged with 'latest' and the short commit SHA.
       - name: Build and push Docker image
         uses: docker/build-push-action@v5
@@ -85,6 +80,6 @@ jobs:
           push: true
           tags: |
             git.max-richter.dev/${{ gitea.repository }}:latest
-            git.max-richter.dev/${{ gitea.repository }}:${{ steps.commit.outputs.sha_short }}
+            git.max-richter.dev/${{ gitea.repository }}:${{ gitea.sha }}
           build-args: |
-            GIT_COMMIT=${{ gitea.commit_sha }}
+            GIT_COMMIT=${{ gitea.sha }}