ci: docker build on github actions

Signed-off-by: Alex Collins <[email protected]>

.dockerignore

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+/.git
+/.github
+/.idea
+/LICENSE
+/release

.github/workflows/docker-image.yml

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+name: Publish Docker image
+
+on:
+  push:
+    tags:
+      - v*
+
+permissions:
+  packages: write
+
+jobs:
+  push_to_registry:
+    name: Push Docker image to GitHub Packages
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out the repo
+        uses: actions/checkout@v3
+
+      - name: Log in to Docker Hub
+        run: echo ${{ secrets.GITHUB_TOKEN }} | docker login ghcr.io -u kitproj --password-stdin
+
+      - name: Build Docker image
+        run: docker build . --tag ghcr.io/kitproj/kafka:latest
+
+      - name: Tag Docker image
+        run: docker tag ghcr.io/kitproj/kafka:latest ghcr.io/kitproj/kafka:${GITHUB_REF#refs/*/}
+
+      - name: Push Docker images
+        run: docker push -a ghcr.io/kitproj/kafka

.gitignore

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+.idea
+*.iml

README.md

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-# kafka-kraft
+# Kafka Docker
 
-A self-contained Docker image for Kafka. Only one image needed, no Zookeeper (it uses KRaft). So much much easier for use in automated tests.
+A self-contained Docker image for Kafka. Typically you must run multiple
+images ([example](https://developer.confluent.io/quickstart/kafka-docker/)). This only requires a single image. This
+reduces the complexity by an order of magnitude.
 
-## Usage
+On Docker:
 
 ```bash
-docker run --rm -p 9092:9092 --name kafka alexcollinsintuit/kafka 
+docker run --rm -p 9092:9092 --name kafka kitproj/kafka 
 ```
 
-## Building
+On Kubernetes:
 
-```bash
-# build the image
-docker build --tag kafka .
-```
-
-```bash
-# push to repository
-docker tag kafka alexcollinsintuit/kafka
-docker push alexcollinsintuit/kafka 
+```yaml
+apiVersion: v1
+kind: Pod
+metadata:
+  name: kafka
+spec:
+  containers:
+    - name: main
+      image: kitproj/kafka
+      ports:
+        - containerPort: 9092
 ```

release

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+#!/bin/sh
+
+command -v semver || go install github.com/ffurrer2/semver/v2/cmd/semver@latest
+
+git tag v$(semver next patch $(git tag|sort -V|tail -n1|cut -c 2-))
+
+git push --tags