BE: prod workflow + docs

Signed-off-by: jokob-sk <jokob.sk@gmail.com>

.github/workflows/docker_prod.yml

@@ -6,7 +6,6 @@
 # GitHub recommends pinning actions to a commit SHA.
 # To get a newer version, you will need to update the SHA.
 # You can also reference a tag or branch, but the action may change without warning.
-
 name: Publish Docker image
 
 on:
@@ -14,6 +13,7 @@ on:
     types: [published]
     tags:
       - '*.[1-9]+[0-9]?.[1-9]+*'
+
 jobs:
   docker:
     runs-on: ubuntu-latest
@@ -21,6 +21,7 @@ jobs:
     permissions:
       contents: read
       packages: write
+
     steps:
       - name: Checkout
         uses: actions/checkout@v3
@@ -31,42 +32,39 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
-      - name: Set up dynamic build ARGs
-        id: getargs        
-        run: echo "version=$(cat ./stable/VERSION)" >> $GITHUB_OUTPUT
-
+      # --- Get release version from tag
       - name: Get release version
         id: get_version
-        run: echo "::set-output name=version::${GITHUB_REF#refs/tags/}"
+        run: echo "version=${GITHUB_REF#refs/tags/}" >> $GITHUB_OUTPUT
 
+      # --- Write version to .VERSION file
       - name: Create .VERSION file
-        run: echo "${{ steps.get_version.outputs.version }}" >> .VERSION
+        run: echo "${{ steps.get_version.outputs.version }}" > .VERSION
 
+      # --- Generate Docker metadata and tags
       - name: Docker meta
         id: meta
         uses: docker/metadata-action@v4
         with:
-          # list of Docker images to use as base name for tags
           images: |
             ghcr.io/jokob-sk/netalertx
-            jokobsk/netalertx  
-          # generate Docker tags based on the following events/attributes
+            jokobsk/netalertx
           tags: |
-            type=semver,pattern={{version}},value=${{ inputs.version }}
-            type=semver,pattern={{major}}.{{minor}},value=${{ inputs.version }}
-            type=semver,pattern={{major}},value=${{ inputs.version }}
+            type=semver,pattern={{version}},value=${{ steps.get_version.outputs.version }}
+            type=semver,pattern={{major}}.{{minor}},value=${{ steps.get_version.outputs.version }}
+            type=semver,pattern={{major}},value=${{ steps.get_version.outputs.version }}
             type=ref,event=branch,suffix=-{{ sha }}
             type=ref,event=pr
             type=raw,value=latest,enable=${{ github.ref == 'refs/heads/main' || startsWith(github.ref, 'refs/tags/') }}
 
-      - name: Log in to Github Container registry
+      - name: Log in to Github Container Registry (GHCR)
         uses: docker/login-action@v3
         with:
           registry: ghcr.io
           username: jokob-sk
           password: ${{ secrets.GITHUB_TOKEN }}
 
-      - name: Login to DockerHub
+      - name: Log in to DockerHub
         if: github.event_name != 'pull_request'
         uses: docker/login-action@v3
         with:
@@ -81,6 +79,5 @@ jobs:
           push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
-          # # ⚠ disable cache if build is failing to download debian packages
           # cache-from: type=registry,ref=ghcr.io/jokob-sk/netalertx:buildcache
           # cache-to: type=registry,ref=ghcr.io/jokob-sk/netalertx:buildcache,mode=max