add github build

.github/workflows/manual_build_github.yml

@@ -0,0 +1,45 @@
+name: Build image (manual)
+
+env:
+  REGISTRY: ghcr.io
+
+on:
+  workflow_dispatch:
+    inputs:
+      image:
+        type: choice
+        required: true
+        description: Image
+        options: 
+        - geoserver
+        - geoserver_data
+        - nginx
+        - postgis
+        - letsencrypt
+      tag:
+        required: true
+        description: Image tag
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v3
+    - name: Login to Registry
+      uses: docker/login-action@v3
+      with:
+        registry: ${{ env.REGISTRY }}
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+    - name: Build and push
+      uses: docker/build-push-action@v5
+      with:
+        file: ./docker/${{ github.event.inputs.image }}/Dockerfile
+        context: "./docker/${{ github.event.inputs.image }}/"
+        image: ghcr.io/ninanor/geonode_${{ github.event.inputs.image }}
+        tags: geonode/${{ github.event.inputs.image }}:${{ github.event.inputs.tag }}
+    - name: Final message
+      run: echo "Built ${{ github.event.inputs.image }} from branch ${{ github.event.inputs.branch }}"