Added container

samples/react-invoice-generator/.devcontainer/devcontainer.json

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+// For more information on how to run this SPFx project in a VS Code Remote Container, please visit https://aka.ms/spfx-devcontainer
+{
+	"name": "SPFx 1.16.1",
+	"image": "docker.io/m365pnp/spfx:1.16.1",
+	// 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": [
+		"editorconfig.editorconfig",
+		"dbaeumer.vscode-eslint"
+	],
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	"forwardPorts": [
+		4321,
+		35729
+	],
+	"portsAttributes": {
+		"4321": {
+			"protocol": "https",
+			"label": "Manifest",
+			"onAutoForward": "silent",
+			"requireLocalPort": true
+		},
+		// Not needed for SPFx>= 1.12.1 
+		// "5432": {
+		// 	"protocol": "https",
+		// 	"label": "Workbench",
+		// 	"onAutoForward": "silent"
+		// },
+		"35729": {
+			"protocol": "https",
+			"label": "LiveReload",
+			"onAutoForward": "silent",
+			"requireLocalPort": true
+		}
+	},
+	"postCreateCommand": "bash .devcontainer/spfx-startup.sh",
+	"remoteUser": "node"
+}

samples/react-invoice-generator/.devcontainer/spfx-startup.sh

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+echo
+echo -e "\e[1;94mInstalling Node dependencies\e[0m"
+npm install
+
+## commands to create dev certificate and copy it to the root folder of the project
+echo
+echo -e "\e[1;94mGenerating dev certificate\e[0m"
+gulp trust-dev-cert
+
+# Convert the generated PEM certificate to a  CER certificate
+openssl x509 -inform PEM -in ~/.rushstack/rushstack-serve.pem -outform DER -out ./spfx-dev-cert.cer
+
+# Copy the PEM ecrtificate for non-Windows hosts
+cp ~/.rushstack/rushstack-serve.pem ./spfx-dev-cert.pem
+
+## add *.cer to .gitignore to prevent certificates from being saved in repo
+if ! grep -Fxq '*.cer' ./.gitignore
+  then
+    echo "# .CER Certificates" >> .gitignore
+    echo "*.cer" >> .gitignore
+fi
+
+## add *.pem to .gitignore to prevent certificates from being saved in repo
+if ! grep -Fxq '*.pem' ./.gitignore
+  then
+    echo "# .PEM Certificates" >> .gitignore
+    echo "*.pem" >> .gitignore
+fi
+
+echo
+echo -e "\e[1;92mReady!\e[0m"
+
+echo -e "\n\e[1;94m**********\nOptional: if you plan on using gulp serve, don't forget to add the container certificate to your local machine. Please visit https://aka.ms/spfx-devcontainer for more information\n**********"