Add Containerfile and Gunicorn example config for deployment

.containerignore

+.gitignore
\ No newline at end of file

.gitignore

 *.pdf
 /instance
 /schilder2000/static
+/gunicorn.conf.py
 
 # Byte-compiled / optimized / DLL files
 __pycache__/

Containerfile

+FROM docker.io/library/node:20-alpine AS build-node
+WORKDIR /usr/app
+COPY . .
+RUN ["npm", "ci"]
+RUN ["npm", "run", "build"]
+
+FROM docker.io/library/python:3.12-alpine AS build-python
+WORKDIR /usr/src/app
+COPY . .
+COPY --from=build-node /usr/app/schilder2000/static ./schilder2000/static
+RUN ["apk", "add", "git"]
+RUN ["pip", "install", "build"]
+RUN ["pyproject-build", "-C", "without-npm"]
+
+FROM docker.io/library/python:3.12-alpine
+RUN ["apk", "add", "pango", "font-terminus", "font-inconsolata", "font-dejavu", "font-noto", "font-noto-cjk", "font-awesome", "font-noto-extra", "libldap", "mariadb-connector-c"]
+COPY --from=build-python /usr/src/app/dist/schilder2000-*.whl /tmp/
+RUN apk add -t .build-deps build-base mysql-dev openldap-dev git && \
+	pip install gunicorn /tmp/schilder2000-*.whl schilder2000[all] && \
+	rm /tmp/schilder2000-*.whl && \
+	apk del .build-deps
+VOLUME /usr/local/var/schilder2000-instance/
+COPY examples /usr/local/var/schilder2000-instance
+WORKDIR /usr/local/var/schilder2000-instance/
+ENV FLASK_APP=schilder2000
+CMD ["gunicorn", "schilder2000:create_app()"]

examples/gunicorn.conf.py

+wsgi_app = "schilder2000:create_app()"
+bind = "[::]:8080"
+accesslog = "-"