Added Docker Build and Publish workflow

.github/workflows/docker-publish.yml

@@ -0,0 +1,43 @@
+name: Docker Build and Publish
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v1
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v3
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

README.md

@@ -64,6 +64,26 @@ go build .
 ./jrpc-interceptor -debug=${LOG_SERVER_DEBUG:-true} -listenSyslog=${LOG_SERVER_URL:-"0.0.0.0:514"} -listenHTTP=${PROMETHEUS_URL:-"0.0.0.0:9100"} -usePrometheus=${USE_PROMETHEUS:-true}
 ```
 
+### Download docker image from github container registry
+
+1. Create a [personal access token ](https://github.com/settings/tokens)(PAT) on github with repo access
+2. Set the PAT as an environment variable
+
+```
+export CR_PAT=<your_pat>
+```
+3. Login to github container registry
+
+```
+echo $CR_PAT | docker login ghcr.io -u USERNAME --password-stdin
+```
+
+4. Download the image
+
+```
+docker pull ghcr.io/NethermindEth/jrpc-interceptor:main
+```
+
 ## Nginx configuration
 All the configuration can be found inside the `nginx` folder.
 
@@ -104,7 +124,7 @@ The interceptor publishes the following metrics:
 - `ngx_request_size_bytes` - the size of the request;
 - `ngx_response_size_bytes` - the size of the response;
 - `ngx_request_duration_seconds` - the time of the request;
-
+```
 For the `ngx_request_duration_seconds` metric, we use `$request_time` value.
 It's the time between the first bytes were read from the client and the log write after the last bytes were sent to the client.