Update devcontainer to latest format.

Add support for .NET 7.0.

Author: bgrainger

.devcontainer/Dockerfile

@@ -1,31 +1,8 @@
-ARG VARIANT="5.0"
-FROM mcr.microsoft.com/dotnet/sdk:${VARIANT}-focal
+ARG VARIANT=6.0-focal
+FROM mcr.microsoft.com/dotnet/sdk:${VARIANT}
 
-# [Option] Install zsh
-ARG INSTALL_ZSH="true"
-# [Option] Upgrade OS packages to their latest versions
-ARG UPGRADE_PACKAGES="true"
+RUN wget https://packages.microsoft.com/config/ubuntu/20.04/packages-microsoft-prod.deb -O packages-microsoft-prod.deb \
+  && dpkg -i packages-microsoft-prod.deb \
+  && rm packages-microsoft-prod.deb
 
-# Install needed packages and setup non-root user. Use a separate RUN statement to add your own dependencies.
-ARG USERNAME=vscode
-ARG USER_UID=1000
-ARG USER_GID=$USER_UID
-COPY library-scripts/common-debian.sh /tmp/library-scripts/
-RUN bash /tmp/library-scripts/common-debian.sh "${INSTALL_ZSH}" "${USERNAME}" "${USER_UID}" "${USER_GID}" "${UPGRADE_PACKAGES}" \
-    && apt-get clean -y && rm -rf /var/lib/apt/lists/* /tmp/library-scripts
-
-# [Option] Install Node.js
-ARG INSTALL_NODE="false"
-ARG NODE_VERSION="none"
-ENV NVM_DIR=/usr/local/share/nvm
-ENV NVM_SYMLINK_CURRENT=true \
-    PATH=${NVM_DIR}/current/bin:${PATH}
-COPY library-scripts/node-debian.sh /tmp/library-scripts/
-RUN if [ "$INSTALL_NODE" = "true" ]; then bash /tmp/library-scripts/node-debian.sh "${NVM_DIR}" "${NODE_VERSION}" "${USERNAME}"; fi \
-    && apt-get clean -y && rm -rf /var/lib/apt/lists/* /tmp/library-scripts
-
-# [Option] Install Azure CLI
-ARG INSTALL_AZURE_CLI="false"
-COPY library-scripts/azcli-debian.sh /tmp/library-scripts/
-RUN if [ "$INSTALL_AZURE_CLI" = "true" ]; then bash /tmp/library-scripts/azcli-debian.sh; fi \
-    && apt-get clean -y && rm -rf /var/lib/apt/lists/* /tmp/library-scripts
+RUN apt-get update && apt-get install -y dotnet-sdk-7.0

.devcontainer/devcontainer.json

@@ -1,30 +1,29 @@
 {
-	"name": "C# (.NET 5.0)",
-	"build": {
-		"dockerfile": "Dockerfile",
-		"args": {
-			// Update 'VARIANT' to pick a .NET version: 5.0
-			"VARIANT": "5.0",
-			// Options
-			"INSTALL_NODE": "false",
-			"NODE_VERSION": "lts/*",
-			"INSTALL_AZURE_CLI": "false"
-		}
-	},
+    "name": "C#",
+    "dockerComposeFile": "docker-compose.yml",
+    "service": "app",
+    "workspaceFolder": "/workspaces/${localWorkspaceFolderBasename}",
 
-	// Set *default* container specific settings.json values on container create.
-	"settings": {
-		"terminal.integrated.shell.linux": "/bin/bash"
-	},
+    // Features to add to the dev container. More info: https://containers.dev/implementors/features.
+    // "features": {},
 
-	// Add the IDs of extensions you want installed when the container is created.
-	"extensions": [
-		"ms-dotnettools.csharp"
-	],
+    // Configure tool-specific properties.
+    "customizations": {
+        // Configure properties specific to VS Code.
+        "vscode": {
+            // Add the IDs of extensions you want installed when the container is created.
+            "extensions": [
+                "ms-dotnettools.csharp"
+            ]
+        }
+    },
 
-	// Use 'postCreateCommand' to run commands after the container is created.
-	"postCreateCommand": "dotnet restore",
+    // Use 'forwardPorts' to make a list of ports inside the container available locally.
+    // "forwardPorts": [3306],
 
-	// Uncomment to connect as a non-root user. See https://aka.ms/vscode-remote/containers/non-root.
-	// "remoteUser": "vscode"
-}
+    // Use 'postCreateCommand' to run commands after the container is created.
+    "postCreateCommand": "dotnet restore"
+
+    // Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+    // "remoteUser": "root"
+}

.devcontainer/docker-compose.yml

@@ -0,0 +1,33 @@
+services:
+  app:
+    build:
+      context: .
+      dockerfile: Dockerfile
+
+    volumes:
+      - ../..:/workspaces:cached
+
+    # Overrides default command so things don't shut down after the process ends.
+    command: sleep infinity
+
+    # Runs app on the same network as the database container, allows "forwardPorts" in devcontainer.json function.
+    network_mode: service:db
+
+    # Uncomment the next line to use a non-root user for all processes.
+    # user: vscode
+
+    # Use "forwardPorts" in **devcontainer.json** to forward an app port locally.
+    # (Adding the "ports" property to this file will not forward from a Codespace.)
+
+  db:
+    image: mysql:8.0
+    restart: unless-stopped
+    volumes:
+      - mysql-data:/var/lib/mysql
+    environment:
+      MYSQL_ROOT_PASSWORD: pass
+      MYSQL_DATABASE: mysqltest
+    entrypoint: docker-entrypoint.sh --max-allowed-packet=96M --character-set-server=utf8mb4 --log-bin-trust-function-creators=1 --local-infile=1 --max-connections=250 --default-authentication-plugin=mysql_native_password
+
+volumes:
+  mysql-data: