ci: add workflow_dispatch trigger in gitpod-image.yml

.github/workflows/gitpod-image.yml

@@ -9,19 +9,20 @@ on:
       - 'main'
     paths:
       - 'gitpod/**'
+  workflow_dispatch:
 
 jobs:
   build-and-push-docker-image:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v1
+        uses: docker/setup-buildx-action@v2
 
       - name: Login to Docker Hub Registry
         if: contains('refs/heads/main', github.ref)
-        uses: docker/login-action@v1
+        uses: docker/login-action@v2
         with:
           username: ${{ secrets.DOCKER_HUB_USERNAME }}
           password: ${{ secrets.DOCKER_HUB_PASSWORD }}