refactor(docker): update build to install pyproject.toml

.devcontainer/Dockerfile

@@ -1,13 +1,15 @@
 FROM eligibility_server:latest
 
-# install python tooling
-COPY .devcontainer/requirements.txt .devcontainer/requirements.txt
-RUN pip install --no-cache-dir -r .devcontainer/requirements.txt
+# install devcontainer requirements
+RUN pip install -e .[dev,test]
 
-# install docs tooling
+# docs requirements are in a separate file for the GitHub Action
 COPY docs/requirements.txt docs/requirements.txt
 RUN pip install --no-cache-dir -r docs/requirements.txt
 
-# install test tooling
-COPY tests/requirements.txt tests/requirements.txt
-RUN pip install -r tests/requirements.txt
+# 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

Dockerfile

@@ -2,15 +2,13 @@ FROM ghcr.io/cal-itp/docker-python-web:main
 
 ENV FLASK_APP=eligibility_server/app.py
 
-# install python app dependencies
-COPY requirements.txt requirements.txt
-RUN pip install --no-cache-dir -r requirements.txt
+# upgrade pip
+RUN python -m pip install --upgrade pip
 
 # copy source files
-COPY bin/ bin/
+COPY bin bin
 COPY eligibility_server/ eligibility_server/
-COPY *.py .
-COPY README.md .
+COPY pyproject.toml pyproject.toml
 
 # install source as a package
 RUN pip install -e .