adding workflow

.github/workflows/devcontainer-feature-build-publish.yml

@@ -0,0 +1,59 @@
+name: spacefx-dev-build-publish
+
+on: 
+    workflow_dispatch:
+    push:
+        branches:
+        - km/add_dev_container_feature
+
+env:
+  REGISTRY: ghcr.io
+  FEATURE: microsoft/azure-orbital-space-sdk/spacefx-dev
+  ARTIFACT_PATH: ./output/spacefx-dev/devcontainer-feature-spacefx-dev.tgz
+
+jobs:
+  build-publish-feature:
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - uses: microsoft/azure-orbital-space-sdk-github-actions/composite-actions/initialize@main
+      with:
+        env_file: ./env/spacefx.env
+        token: ${{ secrets.GITHUB_TOKEN }}
+
+    - uses: microsoft/azure-orbital-space-sdk-github-actions/composite-actions/install-oras@main
+      with:
+        oras_version: 0.16.0
+
+    - uses: microsoft/azure-orbital-space-sdk-github-actions/composite-actions/install-devcontainer-cli@main
+
+    - name: Build and publish devcontainer feature
+      shell: bash
+      run: |
+        echo "Sourcing environment variables..."  
+        source ./env/spacefx.env
+
+        # Validate the output directory exists and clean it out if there is content already present
+        echo "Creating output directory..."
+        mkdir -p "./output/spacefx-dev"
+
+        # Copy the scripts ino the entry point for the devcontainer feature
+        echo "Copying all files to /var/spacedev..."
+        ./.vscode/copy_to_spacedev.sh --output_dir ./.devcontainer/features/spacefx-dev/azure-orbital-space-sdk-setup
+
+        # Build the devcontainer feature
+        echo "Building the devcontainer feature..."
+        devcontainer features package --force-clean-output-folder ./.devcontainer/features --output-folder ./output/spacefx-dev
+
+        # Push the devcontainer feature tarball to the registry
+        echo "Pushing the devcontainer feature tarball to the registry..."
+        oras push ${{ env.REGISTRY }}/${{ env.FEATURE }}:${SPACEFX_VERSION} \
+            --config /dev/null:application/vnd.devcontainers \
+            --annotation org.opencontainers.image.source=https://github.com/microsoft/azure-orbital-space-sdk-setup \
+                    ${{ env.ARTIFACT_PATH }}:application/vnd.devcontainers.layer.v1+tar