Add Bazel feature

src/bazel/README.md

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+## Bazel feature
+
+Install [Bazelisk](https://github.com/bazelbuild/bazelisk) and [Buildifier](https://github.com/bazelbuild/buildtools/blob/master/buildifier/README.md).

src/bazel/devcontainer-feature.json

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+{
+  "name": "Bazel",
+  "id": "bazel",
+  "version": "1.0.0",
+  "description": "Bazel feature",
+  "options": {
+      "bazelisk_version": {
+        "type": "string",
+        "proposals": [
+            "1.17.0",
+            "latest"
+        ],
+        "default": "latest",
+        "description": "Version of Bazelisk to manage Bazel versions"
+      },
+      "buildifier_version": {
+          "type": "string",
+          "proposals": [
+              "5.1.0",
+              "6.1.2",
+              "latest"
+          ],
+          "default": "latest",
+          "description": "Version of Buildifier to lint BUILD files"
+      }
+  },
+  "customizations": {
+      "vscode": {
+          "extensions": [
+            "bazelbuild.vscode-bazel"
+          ]
+      }
+  }
+}

src/bazel/install.sh

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+#!/bin/sh
+set -eu
+
+echo "Installing Bazel"
+
+LOCAL_BIN="/usr/local/bin"
+
+github_download() {
+    repo=$1
+    version=$2
+    artifact=$3
+    output=$4
+    if [ "${version}" = "latest" ]; then
+        URL="https://github.com/${repo}/releases/latest/download/${artifact}"
+    else
+        URL="https://github.com/${repo}/releases/download/${version}/${artifact}"
+    fi
+    curl -LSs "${URL}" -o "${output}"
+}
+
+github_download "bazelbuild/bazelisk" "${BAZELISK_VERSION}" "bazelisk-linux-amd64" "${LOCAL_BIN}/bazelisk"
+chmod +x "${LOCAL_BIN}/bazelisk"
+ln -s "${LOCAL_BIN}/bazelisk" "${LOCAL_BIN}/bazel"
+
+github_download "bazelbuild/buildtools" "${BUILDIFIER_VERSION}" "buildifier-linux-amd64" "${LOCAL_BIN}/buildifier"
+chmod +x "${LOCAL_BIN}/buildifier"