Add Docker Hub build GitHub Action

- Create GitHub Action workflow for building and pushing to Docker Hub
- Update README with usage instructions
- Workflow accepts Elasticsearch version as input parameter

Author: gido

.github/workflows/docker-build.yml

@@ -0,0 +1,39 @@
+name: Build and Push Docker Image
+
+on:
+  workflow_dispatch:
+    inputs:
+      elasticsearch_version:
+        description: 'Elasticsearch version'
+        required: true
+        default: '8.18.1'
+        type: string
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Login to DockerHub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Update Dockerfile with input version
+        run: |
+          sed -i "s|FROM elasticsearch:.*|FROM elasticsearch:${{ github.event.inputs.elasticsearch_version }}|" Dockerfile
+
+      - name: Build and push
+        uses: docker/build-push-action@v4
+        with:
+          context: .
+          push: true
+          tags: |
+            antistatique/elasticsearch:latest
+            antistatique/elasticsearch:${{ github.event.inputs.elasticsearch_version }}

Dockerfile

@@ -0,0 +1,5 @@
+FROM elasticsearch:8.18.1
+
+RUN /usr/share/elasticsearch/bin/elasticsearch-plugin install analysis-icu && \
+    /usr/share/elasticsearch/bin/elasticsearch-plugin install analysis-phonetic
+

README.md

@@ -1 +1,29 @@
 # docker-elasticsearch
+
+Custom Elasticsearch Docker image with ICU and Phonetic analysis plugins pre-installed.
+
+## Usage
+
+```
+docker pull antistatique/elasticsearch:latest
+```
+
+## GitHub Workflow
+
+This repository includes a GitHub Action workflow that can be manually triggered to:
+1. Build the Docker image with a specified Elasticsearch version
+2. Push the image to Docker Hub as `antistatique/elasticsearch:[version]` and `antistatique/elasticsearch:latest`
+
+### Required Secrets
+
+The following secrets need to be configured in your GitHub repository:
+- `DOCKERHUB_USERNAME`: Your Docker Hub username
+- `DOCKERHUB_TOKEN`: Your Docker Hub access token
+
+### Running the Workflow
+
+1. Go to the "Actions" tab in your GitHub repository
+2. Select the "Build and Push Docker Image" workflow
+3. Click "Run workflow"
+4. Enter the desired Elasticsearch version (defaults to 8.18.1)
+5. Click "Run workflow"