Run Gnitpick using container action

.github/workflows/gnitpick.yml

@@ -1,21 +1,13 @@
 name: "Nitpick git commits"
 
-on: [push, pull_request]
-
-env:
-  PYTHON_VERSION: 3.6
+on: [push]
 
 jobs:
   nitpick:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - name: Setup repository
-        uses: actions/checkout@v2
-
-      - name: Set up python ${{ env.PYTHON_VERSION }}
-        uses: actions/setup-python@v2
-        with:
-          python-version: ${{ env.PYTHON_VERSION }}
+        uses: actions/checkout@v4
 
       - name: Run gnitpick
-        run: python3 gnitpick.py --verbose
+        uses: Seravo/gnitpick@feature/container

Dockerfile

@@ -0,0 +1,20 @@
+FROM ghcr.io/seravo/ubuntu:noble
+
+ARG APT_PROXY
+
+RUN sed -i 's/main$/main universe/g' /etc/apt/sources.list && \
+    apt-setup && \
+    apt-get --assume-yes install \
+      python3 && \
+    apt-cleanup
+
+RUN useradd user && \
+    mkdir -p /workdir
+WORKDIR /workdir
+
+COPY gnitpick.py /usr/local/bin/
+
+USER user
+
+ENTRYPOINT ["/usr/bin/python3", "/usr/local/bin/gnitpick.py"]
+CMD ["--verbose"]

action.yml

@@ -0,0 +1,9 @@
+---
+name: 'Lint git commits'
+description: 'Run linting for git commits with Gnitpick'
+
+runs:
+  using: 'docker'
+  image: 'Dockerfile'
+  args:
+    - '--verbose'