Swift: tweaks to codespace setup

.devcontainer/swift/Dockerfile

@@ -1,11 +1,8 @@
 # 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}
+FROM mcr.microsoft.com/vscode/devcontainers/cpp:0-ubuntu-22.04
 
-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

@@ -14,9 +14,6 @@
 	},
 	"build": {
 		"dockerfile": "Dockerfile",
-		"args": {
-			"VARIANT": "ubuntu-20.04"
-		}
 	},
 	"runArgs": [
 		"--cap-add=SYS_PTRACE",

.devcontainer/swift/root.sh

@@ -1,15 +1,19 @@
 set -xe
 
+BAZELISK_VERSION=v1.12.0
+BAZELISK_DOWNLOAD_SHA=6b0bcb2ea15bca16fffabe6fda75803440375354c085480fe361d2cbf32501db
+
 apt-get update
 export DEBIAN_FRONTEND=noninteractive
 apt-get -y install --no-install-recommends \
     zlib1g-dev \
     uuid-dev \
     python3-distutils \
-    python3-pip
+    python3-pip \
+    bash-completion
 
 # 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 "${BAZELISK_DOWNLOAD_SHA} */usr/local/bin/bazelisk" | sha256sum --check - )
+echo "${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

@@ -12,11 +12,4 @@ bazel run swift/create-extractor-pack
 python3 -m pip install pre-commit --no-warn-script-location
 $HOME/.local/bin/pre-commit install
 
-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
+cat $(dirname $0)/user_bashrc.sh >> $HOME/.bashrc

.devcontainer/swift/user_bashrc.sh

@@ -0,0 +1,5 @@
+# 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