Swift: add devcontainer setup

.devcontainer/swift/Dockerfile

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+# See here for image contents: https://github.com/microsoft/vscode-dev-containers/tree/v0.236.0/containers/cpp/.devcontainer/base.Dockerfile
+
+# [Choice] Debian / Ubuntu version (use Debian 11, Ubuntu 18.04/22.04 on local arm64/Apple Silicon): debian-11, debian-10, ubuntu-22.04, ubuntu-20.04, ubuntu-18.04
+ARG VARIANT="bullseye"
+FROM mcr.microsoft.com/vscode/devcontainers/cpp:0-${VARIANT}
+
+ARG BAZELISK_VERSION=v1.10.1
+ARG BAZELISK_DOWNLOAD_SHA=dev-mode
+USER root
+ADD root.sh /tmp/root.sh
+RUN bash /tmp/root.sh && rm /tmp/root.sh

.devcontainer/swift/devcontainer.json

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+{
+	"extensions": [
+		"github.vscode-codeql",
+		"hbenl.vscode-test-explorer",
+		"ms-vscode.test-adapter-converter",
+		"slevesque.vscode-zipexplorer",
+		"ms-vscode.cpptools"
+	],
+	"settings": {
+		"files.watcherExclude": {
+			"**/target/**": true
+		},
+		"codeQL.runningQueries.memory": 2048
+	},
+	"build": {
+		"dockerfile": "Dockerfile",
+		"args": {
+			"VARIANT": "ubuntu-20.04"
+		}
+	},
+	"runArgs": [
+		"--cap-add=SYS_PTRACE",
+		"--security-opt",
+		"seccomp=unconfined"
+	],
+	"remoteUser": "vscode",
+	"onCreateCommand": ".devcontainer/swift/user.sh"
+}

.devcontainer/swift/root.sh

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+set -xe
+
+apt-get update
+export DEBIAN_FRONTEND=noninteractive
+apt-get -y install --no-install-recommends \
+    zlib1g-dev \
+    uuid-dev \
+    python3-distutils
+
+# Install Bazel
+curl -fSsL -o /usr/local/bin/bazelisk https://github.com/bazelbuild/bazelisk/releases/download/${BAZELISK_VERSION}/bazelisk-linux-amd64
+([ "${BAZELISK_DOWNLOAD_SHA}" = "dev-mode" ] || echo "${BAZELISK_DOWNLOAD_SHA} */usr/local/bin/bazelisk" | sha256sum --check - )
+chmod 0755 /usr/local/bin/bazelisk
+ln -s bazelisk /usr/local/bin/bazel

.devcontainer/swift/user.sh

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+set -xe
+
+# add the workspace to the codeql search path
+mkdir -p /home/vscode/.config/codeql
+echo "--search-path /workspaces/codeql" > /home/vscode/.config/codeql/config
+
+# create a swift extractor pack with the current state
+cd /workspaces/codeql
+bazel run swift/create-extractor-pack
+
+cat >> $HOME/.bashrc << EOF
+
+# have the codeql binary installed by vscode automatically in PATH
+bin=\$(ls \$HOME/.vscode-remote/data/User/globalStorage/github.vscode-codeql/*/codeql/codeql -t 2>/dev/null | head -1)
+if [[ -n \$bin ]]; then
+  export PATH=\$PATH:$(dirname "\$bin")
+fi
+EOF