feat: add build time and version info to Docker image and page footer

Agent-Logs-Url: https://github.com/wahyd4/links/sessions/514d1f3d-d003-4f16-9a54-d221dba306f7

Co-authored-by: wahyd4 <836576+wahyd4@users.noreply.github.com>

.github/workflows/build-and-deploy.yml

@@ -60,6 +60,10 @@ jobs:
       with:
         images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
 
+    - name: Set build timestamp
+      id: build_time
+      run: echo "value=$(date -u '+%Y-%m-%d %H:%M:%S UTC')" >> $GITHUB_OUTPUT
+
     # Build and push main application image
     - name: Build and push Docker image
       uses: docker/build-push-action@v6
@@ -72,6 +76,9 @@ jobs:
           ghcr.io/wahyd4/links:1.0.${{ github.run_number }}
         labels: |-
           ${{ steps.meta.outputs.labels }}
+        build-args: |-
+          BUILD_TIME=${{ steps.build_time.outputs.value }}
+          BUILD_VERSION=1.0.${{ github.run_number }}
 
     - name: Deploy to Kubernetes
       uses: wahyd4/kubectl-helm-action@master