Push a Docker image to Dockerhub at release time

.github/workflows/release.yml

@@ -29,4 +29,12 @@ jobs:
         upload_url: ${{ github.event.release.upload_url }}
         asset_path: ./cryptowat_exporter
         asset_name: cryptowat_exporter_${{ github.event.release.tag_name}}_linux_amd64
-        asset_content_type: application/binary
+        asset_content_type: application/binary
+    - name: Push Docker image
+      id: push-docker-image
+      uses: docker/build-push-action@v1
+      with:
+        username: ${{ secrets.DOCKER_USERNAME }}
+        password: ${{ secrets.DOCKER_PASSWORD }}
+        repository: nbarrientos/cryptowat_exporter-linux-amd64
+        tags: latest

README.md

@@ -4,34 +4,49 @@ A [Prometheus](https://prometheus.io/) exporter to fetch values from [cryptowat.
 
 ## Installation
 
-Binaries can be downloaded from the Github releases page. A Docker image will be released soon.
+Binaries can be downloaded from the Github releases page. A Docker image hosted on Dockerhub is also available.
 
 Building yourself is rather easy, just install `golang` and `make` and run:
 
 ```
 make
 ```
 
-To build a Docker image, adjust the Docker architectures in the `Makefile` and run:
+To build a Docker image yourself, adjust the Docker architectures in the `Makefile` and run:
 
 ```
 make docker
 ```
 
+To use the pre-built image just pull it:
+
+```
+docker pull nbarrientos/cryptowat_exporter-linux-amd64
+```
+
 ## Usage
 
 ```
 ./cryptowat_exporter
 ```
 
-or with Docker:
+or with Docker (self-built):
 
 ```
 sudo docker run -d --name cryptowat_exporter -e "TZ=Europe/Zurich" --user yourchoice -p 9745:9745 prom/cryptowat_exporter-linux-amd64:master
 ```
 
+or pre-built:
+
+```
+sudo docker run -d --name cryptowat_exporter -e "TZ=Europe/Zurich" --user yourchoice -p 9745:9745 nbarrientos/cryptowat_exporter-linux-amd64
+```
+
 Then visit `http://localhost:9745/metrics`
 
+Please note that publishing the exposed ports is optional. For instance if you do IPv6 global address allocation at container start time
+you might not want to pass `-p` at all.
+
 ## Configuration
 
 The exporter takes some command line parameters that allow configuring a few things: