fix: switch to image that can install pip

Dockerfile

@@ -1,12 +1,10 @@
-# Container image that runs your code
-FROM alpine:3.21
+FROM gitea/runner-images:ubuntu-latest
+
+LABEL maintainer="Luke Tainton <luke@tainton.uk>"
 
-# Install python/pip
 ENV PYTHONUNBUFFERED=1
-RUN apk add --update --no-cache python3 && \
-    ln -sf python3 /usr/bin/python && \
-    python3 -m ensurepip && \
-    pip3 install --no-cache --upgrade pip setuptools conventional-pre-commit
+RUN python3 -m pip install --no-cache --upgrade pip && \
+    python3 -m pip install --no-cache conventional-pre-commit==4.0.0
 
 # Copies your code file from your action repository to the filesystem path `/` of the container
 COPY entrypoint.sh /entrypoint.sh

README.md

@@ -20,7 +20,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@master
-      - uses: https://git.tainton.uk/actions/conventional-commits-docker-action@v1.0.0
+      - uses: https://git.tainton.uk/actions/conventional-commits-check-action@v1.0.0
         with:
           commit-message: ${{ github.event.pull_request.title }}
 ```
@@ -36,7 +36,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@master
-      - uses: https://git.tainton.uk/actions/conventional-commits-docker-action@v1.0.0
+      - uses: https://git.tainton.uk/actions/conventional-commits-check-action@v1.0.0
         with:
           commit-message: ${{ github.event.head_commit.message }}
 ```