Few updates in ci jobs and go.mod/dockerfile (#372)

* update go.mod to 1.20
* clean up and format ci jobs
* update go and alpine images in dockerfile

Signed-off-by: cpanato <ctadeu@gmail.com>

.github/workflows/docker-build.yml

@@ -1,15 +1,20 @@
 name: Docker Image
+
 on:
   push:
-    branches: [ "main" ]
-    tags: [ "v*" ]
+    branches:
+      - main
+    tags:
+      - 'v*'
   pull_request:
+
 jobs:
   build:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
         uses: actions/checkout@v3
+
       - name: Docker meta
         id: meta
         uses: docker/metadata-action@v4
@@ -25,18 +30,22 @@ jobs:
             type=edge,branch=main
           flavor: |
             latest=auto
+
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v2
         with:
           platforms: all
+
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v2
+
       - name: Login to DockerHub
         if: github.event_name != 'pull_request'
         uses: docker/login-action@v2
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
+
       - name: Login to GitHub Container Registry
         if: github.event_name != 'pull_request'
         uses: docker/login-action@v2
@@ -44,6 +53,7 @@ jobs:
           registry: ghcr.io
           username: ${{ github.repository_owner }}
           password: ${{ secrets.GITHUB_TOKEN }}
+
       - name: Build and push
         uses: docker/build-push-action@v4
         with: