feat: Add build-dev-container workflow and Ubuntu devcontainer

- Added a new workflow file `build-dev-container.yaml` to build the development container.
- Created a new devcontainer configuration file `devcontainer.json` for Ubuntu.
- The workflow sets up a matrix based on subfolders in the templates directory.
- The build step now uses the subfolder from the matrix to specify the template and image name.

This commit adds support for building the development container and includes an initial configuration for Ubuntu.

.github/workflows/build-dev-container.yaml

@@ -6,10 +6,28 @@ on: # rebuild any PRs and main branch changes
       - master
 
 jobs:
-  build:
+  prepare:
     runs-on: ubuntu-latest
+    outputs:
+      matrix: ${{ steps.set-matrix.outputs.matrix }}
     steps:
+      - name: Checkout (GitHub)
+        uses: actions/checkout@v3
 
+      - name: Set matrix for build
+        id: set-matrix
+        run: |
+          FOLDERS=$(ls -d templates/*/)
+          FOLDERS=${FOLDERS//\//} # remove trailing slashes
+          FOLDERS=${FOLDERS//templates\//} # remove leading 'templates/'
+          FOLDERS_JSON=$(echo "$FOLDERS" | jq -R -s -c 'split("\n")[:-1]')
+          echo "::set-output name=matrix::${FOLDERS_JSON}"
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        subfolder: ${{fromJson(needs.prepare.outputs.matrix)}}
+    steps:
       - name: Checkout
         uses: actions/checkout@v4
 
@@ -29,7 +47,7 @@ jobs:
       - name: Build and run Dev Container task
         uses: devcontainers/[email protected]
         with:
-          subFolder: ./templates/react-native
-          imageName: ghcr.io/pnstack/codespace/react-native
+          subFolder: ./templates/${{ matrix.subfolder }}
+          imageName: ghcr.io/pnstack/codespace/${{ matrix.subfolder }}
           platform: linux/amd64,linux/arm64
           push: always

templates/ubuntu/.devcontainer/devcontainer.json

@@ -0,0 +1,21 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/ubuntu
+{
+  "name": "Ubuntu",
+  // Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
+  "image": "mcr.microsoft.com/devcontainers/base:jammy",
+  "runArgs": ["--device=/dev/net/tun"],
+  "features": {},
+
+  // Use 'forwardPorts' to make a list of ports inside the container available locally.
+  // "forwardPorts": [],
+
+  // Use 'postCreateCommand' to run commands after the container is created.
+  // "postCreateCommand": "uname -a",
+
+  // Configure tool-specific properties.
+  // "customizations": {},
+
+  // Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+  "remoteUser": "root"
+}