explain the bashrc hook

.devcontainer/devcontainer.json

@@ -42,8 +42,7 @@
     // "runServices": [],
     // Uncomment the next line if you want to keep your containers running after VS Code shuts down.
     // "shutdownAction": "none",
-    // The next line to run commands after the container is created, making pytest work in this case
-    // Not needed if using gneiss
+    // The next line to run commands after the container is created, it auto-installs precommit hooks and the library
     "postCreateCommand": "echo \"\\nif [ -f /home/seismo/workspace/.devcontainer/.bashrc ]; then\\n  . /home/seismo/workspace/.devcontainer/.bashrc;\\nfi\" >> $HOME/.bashrc",
     // Uncomment the next line to have VS Code connect as an existing non-root user in the container. See
     // https://aka.ms/vscode-remote/containers/non-root for details on adding a non-root user if none exist.