Support devcontainer (#3334)

Author: keegan-caruso

.devcontainer/Dockerfile

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+# See here for image contents: https://github.com/devcontainers/images/blob/main/src/dotnet/.devcontainer/Dockerfile
+# Example of using a preview version: mcr.microsoft.com/devcontainers/dotnet:10.0-preview
+
+FROM mcr.microsoft.com/vscode/devcontainers/dotnet:latest
+
+# [Option] Install Node.js
+ARG INSTALL_NODE="true"
+ARG NODE_VERSION="lts/*"
+RUN if [ "${INSTALL_NODE}" = "true" ]; then su vscode -c "umask 0002 && . /usr/local/share/nvm/nvm.sh && nvm install ${NODE_VERSION} 2>&1"; fi

.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/devcontainers/images/tree/main/src/dotnet
+{
+    "name": "C# (.NET)",
+    "build": {
+      "dockerfile": "Dockerfile",
+      "args": {
+        // Options
+        "INSTALL_NODE": "true",
+        "NODE_VERSION": "lts/*"
+      }
+    },
+    // Add the IDs of extensions you want installed when the container is created.
+    "customizations": {
+        "vscode": {
+            "extensions": [
+                "ms-dotnettools.csdevkit"
+            ],
+            "settings": {
+                "dotnet.defaultSolution": "Microsoft.Identity.Web.sln",
+                "omnisharp.enableRoslynAnalyzers": true,
+                "omnisharp.enableEditorConfigSupport": true,
+                "omnisharp.enableImportCompletion": true
+            }
+        }
+    },
+    // Use 'postCreateCommand' to run commands after the container is created.
+    "onCreateCommand": "bash -i ${containerWorkspaceFolder}/.devcontainer/scripts/container-creation.sh",
+    // Comment out connect as root instead. More info: https://aka.ms/vscode-remote/containers/non-root.
+    "remoteUser": "vscode",
+    "hostRequirements": {
+      "cpus": 4
+    },
+    "features": {
+        "ghcr.io/devcontainers/features/azure-cli:1": {},
+        "ghcr.io/devcontainers/features/dotnet:2": {
+          "workloads": "wasm-tools"
+        }
+      }
+  }

.devcontainer/scripts/container-creation.sh

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+#!/usr/bin/env bash
+
+set -e
+
+# Add .NET Dev Certs to environment to facilitate debugging.
+# Do **NOT** do this in a public base image as all images inheriting
+# from the base image would inherit these dev certs as well.
+dotnet dev-certs https
+
+# The container creation script is executed in a new Bash instance
+# so we exit at the end to avoid the creation process lingering.
+exit

.vscode/settings.json

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+{
+    "files.trimTrailingWhitespace": true,
+    "files.associations": {
+      "*.*proj": "xml",
+      "*.props": "xml",
+      "*.targets": "xml",
+      "*.tasks": "xml"
+    }
+  }