Add vscode overlay that pins 1.52.1 so that liveshare works

overlays/vscode/update-vscode.sh

@@ -0,0 +1,36 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -i bash -p curl jq gnused
+
+# Update script for the vscode versions and hashes.
+# Usually doesn't need to be called by hand,
+# but is called by a bot: https://github.com/samuela/nixpkgs-upkeep/actions
+# Call it by hand if the bot fails to automatically update the versions.
+
+set -eou pipefail
+
+ROOT="$(dirname "$(readlink -f "$0")")"
+if [ ! -f "$ROOT/vscode.nix" ]; then
+  echo "ERROR: cannot find vscode.nix in $ROOT"
+  exit 1
+fi
+
+# VSCode
+
+VSCODE_VER=$(curl --fail --silent https://api.github.com/repos/Microsoft/vscode/releases/latest | jq --raw-output .tag_name)
+sed -i "s/version = \".*\"/version = \"${VSCODE_VER}\"/" "$ROOT/vscode.nix"
+
+VSCODE_LINUX_URL="https://vscode-update.azurewebsites.net/${VSCODE_VER}/linux-x64/stable"
+VSCODE_LINUX_SHA256=$(nix-prefetch-url ${VSCODE_LINUX_URL})
+sed -i "s/x86_64-linux = \".\{52\}\"/x86_64-linux = \"${VSCODE_LINUX_SHA256}\"/" "$ROOT/vscode.nix"
+
+VSCODE_DARWIN_URL="https://vscode-update.azurewebsites.net/${VSCODE_VER}/darwin/stable"
+VSCODE_DARWIN_SHA256=$(nix-prefetch-url ${VSCODE_DARWIN_URL})
+sed -i "s/x86_64-darwin = \".\{52\}\"/x86_64-darwin = \"${VSCODE_DARWIN_SHA256}\"/" "$ROOT/vscode.nix"
+
+VSCODE_LINUX_AARCH64_URL="https://vscode-update.azurewebsites.net/${VSCODE_VER}/linux-arm64/stable"
+VSCODE_LINUX_AARCH64_SHA256=$(nix-prefetch-url ${VSCODE_LINUX_AARCH64_URL})
+sed -i "s/aarch64-linux = \".\{52\}\"/aarch64-linux = \"${VSCODE_LINUX_AARCH64_SHA256}\"/" "$ROOT/vscode.nix"
+
+VSCODE_LINUX_ARMV7L_URL="https://vscode-update.azurewebsites.net/${VSCODE_VER}/linux-armhf/stable"
+VSCODE_LINUX_ARMV7L_SHA256=$(nix-prefetch-url ${VSCODE_LINUX_ARMV7L_URL})
+sed -i "s/armv7l-linux = \".\{52\}\"/armv7l-linux = \"${VSCODE_LINUX_ARMV7L_SHA256}\"/" "$ROOT/vscode.nix"