fix: update Docker image tags to use lowercase repository owner and improve pull command output

.gitea/workflows/build-and-push.yaml

@@ -20,6 +20,14 @@ jobs:
           echo "📁 Repository contents:"
           ls -la ${{ gitea.workspace }}
       
+      - name: Prepare registry path
+        id: prep
+        run: |
+          # Convert repository owner to lowercase
+          REPO_OWNER=$(echo "${{ gitea.repository_owner }}" | tr '[:upper:]' '[:lower:]')
+          echo "repo_owner=${REPO_OWNER}" >> $GITHUB_OUTPUT
+          echo "📝 Repository owner (lowercase): ${REPO_OWNER}"
+      
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
       
@@ -37,8 +45,10 @@ jobs:
         with:
           context: .
           push: true
-          tags: git.eurekin.pl/${{ gitea.repository_owner }}/hello-gitea:latest,git.eurekin.pl/${{ gitea.repository_owner }}/hello-gitea:${{ gitea.sha }}
+          tags: |
+            git.eurekin.pl/${{ steps.prep.outputs.repo_owner }}/hello-gitea:latest
+            git.eurekin.pl/${{ steps.prep.outputs.repo_owner }}/hello-gitea:${{ gitea.sha }}
       
       - run: echo "📦 Docker image has been pushed to the registry!"
-      - run: echo "🎯 You can pull it with docker pull git.eurekin.pl/${{ gitea.repository_owner }}/hello-gitea latest"
+      - run: echo "🎯 You can pull it with: docker pull git.eurekin.pl/${{ steps.prep.outputs.repo_owner }}/hello-gitea:latest"
       - run: echo "🍏 This job's status is ${{ job.status }}."