Create improved Dockerfile with volume mounts for storing data

* Add volume mounts to Dockerfile to enable persisten storing of
  database and tokens when using docker
* Makefile helps with cleanup and building the Dockerfile
* Startup fires the predictify runtime inside the container
* `.dockerignore` contains files that are not needed by the docker,
  e.g. files that would otherwise slow build process down

docker/Dockerfile

@@ -0,0 +1,35 @@
+FROM alpine:3.21.3
+
+# Set environment variables
+ARG PROJ_NAME
+ENV PROJ_NAME=${PROJ_NAME}
+
+RUN mkdir -p /app/${PROJ_NAME}
+
+# The following steps are executed from the specified directory below
+WORKDIR /app/${PROJ_NAME}
+
+# Install all necessary software
+RUN apk add --no-cache python3 sqlite
+
+# Create the directories, needed for persistent storage (e.g. database, tokens)
+RUN mkdir ./data ./src ./config
+
+# Create mount points for logs, data, src and config
+VOLUME /var/log ./data ./src ./config
+
+# Copy the application source code
+COPY ./src/ ./src/
+
+# Create a seperate venv inside the container & install requirements
+COPY ./requirements.txt ./requirements.txt
+RUN \
+    python -m venv .venv && \
+    source .venv/bin/activate && \
+    ./.venv/bin/pip install -r ./requirements.txt && \
+    deactivate
+
+COPY ./docker/startup.sh ./startup.sh
+
+# When starting the contianer the following is executed
+ENTRYPOINT  ["./startup.sh"]