5.2 Build the application image 📦️

The sourcecode for my demo application is located on github/gerundium

Step by step guide:

Create your Containerfile

# Containerfile.yaml
# Use the official Python image from the Docker Hub
FROM python:3.12-slim

# Set labels
LABEL maintainer="gerundium@mailbox.org"
LABEL app="gerundium-brand-voting-app"

# Set the working directory inside the container
WORKDIR /app

# Copy the requirements.txt file into the container at /app
COPY requirements.txt /app/

# Install the Python dependencies
RUN pip install --no-cache-dir -r requirements.txt

# Copy the rest of the application files into the container
COPY . /app/

# Expose the port that Streamlit will run on
EXPOSE 8501

# Command to run the application when the container starts
CMD ["streamlit", "run", "gerundium-brand-voting-app.py"]

Trigger the image build process

COMMIT_SHA=$(git rev-parse --short HEAD); docker build -t gerundium/github-event-poller:$COMMIT_SHA -t gerundium/github-event-poller:latest  --file ./Containerfile .

Explanation💡
`COMIMIT_SHA`	Create a unique commit SHA
`-t gerundium/github-event-poller:$COMMIT_SHA`	Set image tag 1
`-t gerundium/github-event-poller:latest`	Set image tag 2
`--file ./Containerfile .`	Specify the souce file for the build command

Push image and tags to your registry

docker push gerundium/github-event-poller:$COMMIT_SHA
docker push gerundium/brand-voting-app:latest