Add VSCode Dev Container with test

.devcontainer/Dockerfile

@@ -0,0 +1,16 @@
+# See here for image contents: https://github.com/microsoft/vscode-dev-containers/tree/v0.224.3/containers/typescript-node/.devcontainer/base.Dockerfile
+
+# [Choice] Node.js version (use -bullseye variants on local arm64/Apple Silicon): 16, 14, 12, 16-bullseye, 14-bullseye, 12-bullseye, 16-buster, 14-buster, 12-buster
+ARG VARIANT="16-bullseye"
+FROM mcr.microsoft.com/vscode/devcontainers/typescript-node:0-${VARIANT}
+
+# [Optional] Uncomment this section to install additional OS packages.
+# RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
+#     && apt-get -y install --no-install-recommends <your-package-list-here>
+
+# [Optional] Uncomment if you want to install an additional version of node using nvm
+# ARG EXTRA_NODE_VERSION=10
+# RUN su node -c "source /usr/local/share/nvm/nvm.sh && nvm install ${EXTRA_NODE_VERSION}"
+
+# [Optional] Uncomment if you want to install more global node packages
+# RUN su node -c "npm install -g <your-package-list -here>"

.devcontainer/devcontainer.json

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+// For format details, see https://aka.ms/devcontainer.json. For config options, see the README at:
+// https://github.com/microsoft/vscode-dev-containers/tree/v0.224.3/containers/typescript-node
+{
+	"name": "Podcast RSS for Node",
+	"build": {
+		"dockerfile": "Dockerfile",
+		// Update 'VARIANT' to pick a Node version: 16, 14, 12.
+		// Append -bullseye or -buster to pin to an OS version.
+		// Use -bullseye variants on local on arm64/Apple Silicon.
+		"args": { 
+			"VARIANT": "16-bullseye"
+		}
+	},
+
+	// Set *default* container specific settings.json values on container create.
+	"settings": {},
+
+
+	// Add the IDs of extensions you want installed when the container is created.
+	"extensions": [
+		"dbaeumer.vscode-eslint",
+		"cschleiden.vscode-github-actions"
+	],
+
+	// 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": "yarn install",
+
+	// Comment out to connect as root instead. More info: https://aka.ms/vscode-remote/containers/non-root.
+	"remoteUser": "node"
+}

.github/workflows/devcontainer.yml

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+name: Dev Container CI
+
+on:
+  workflow_dispatch:
+  push:
+    branches: [ master ]
+    paths: 
+      - .devcontainer/**
+  pull_request:
+    branches: [ master ]
+    paths: 
+      - .devcontainer/**
+
+jobs:
+
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Get the version
+      id: vars
+      run: echo ::set-output name=tag::$(echo ${GITHUB_RUN_ID})
+    - name: Build the Docker image
+      run: docker build . --file Dockerfile --tag vsc-node-podcast:${{steps.vars.outputs.tag}}
+      working-directory: .devcontainer
+    - name: Run the container
+      run: docker run --rm -v `pwd`:/workspaces/node-podcast --workdir /workspaces/node-podcast vsc-node-podcast:${{steps.vars.outputs.tag}} /bin/sh -c "npm install && npm run build && npm run test && npm run example"

.github/workflows/node.js.yml

@@ -4,9 +4,13 @@ on:
   push:
     branches:
       - "*"
+    paths-ignore:
+      - .devcontainer/**
   pull_request:
     branches:
       - "*"
+    paths-ignore:
+      - .devcontainer/**
 
 jobs:
   build: