Pin pydantic<2 and use Micromamba for pre-commit in CI (#41)

* Pin pydantic<2.

* Use micromamba for pre-commit in CI.

* Rename step.

.github/workflows/ci.yml

@@ -55,10 +55,18 @@ jobs:
     name: Run pre-commit
     timeout-minutes: 15
     runs-on: ubuntu-latest
+    env:
+      PRE_COMMIT_USE_MICROMAMBA: 1
     steps:
       - name: Checkout branch
-        uses: actions/[email protected]
-      - name: Install Python 3.11
+        uses: actions/[email protected]
+        with:
+          ref: ${{ github.head_ref }}
+      - name: Set up micromamba
+        uses: mamba-org/setup-micromamba@2b72821d5ad7f6da3c003a3684ce341bf187b46f
+      - name: Add micromamba to GITHUB_PATH
+        run: echo "${HOME}/micromamba-bin" >> "$GITHUB_PATH"
+      - name: Install Python
         uses: actions/setup-python@v4
         with:
           python-version: 3.11

environment.yml

@@ -22,5 +22,6 @@ dependencies:
   - fire
   - requests
   - dacite
+  - pydantic<2
   - pip:
       - git+https://github.com/jupyter-server/jupyter_releaser.git@v2