refactor(devcontainer): init pre-commit in postAttach

Author: thekaveman

.devcontainer/Dockerfile

@@ -20,11 +20,4 @@ COPY compiler_admin compiler_admin
 COPY pyproject.toml pyproject.toml
 RUN pip install -e .[dev,test]
 
-# install pre-commit environments in throwaway Git repository
-# https://stackoverflow.com/a/68758943
-COPY .pre-commit-config.yaml .
-RUN git init . && \
-    pre-commit install-hooks && \
-    rm -rf .git
-
 CMD ["sleep", "infinity"]

.devcontainer/devcontainer.json

@@ -3,6 +3,7 @@
   "dockerComposeFile": ["../compose.yaml"],
   "service": "dev",
   "workspaceFolder": "/home/compiler/admin",
+  "postAttachCommand": ["/bin/bash", ".devcontainer/postAttach.sh"],
   "customizations": {
     "vscode": {
       // Set *default* container specific settings.json values on container create.

.devcontainer/postAttach.sh

@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+set -eu
+
+pre-commit install --install-hooks