replaced branch build by PR build only (#203)

.github/workflow.md

@@ -8,7 +8,7 @@ This project uses three separate Docker build workflows that automatically build
 |----------|---------|--------------|
 | [docker-build-release.yml](.github/workflows/docker-build-release.yml) | Tags: `v1.2.0`, `v1.2.0-alpha1` | `1.2.0`, `1.2`, `latest` |
 | [docker-build-nightly.yml](.github/workflows/docker-build-nightly.yml) | Push to `main` | `nightly` |
-| [docker-build-branch.yml](.github/workflows/docker-build-branch.yml) | All other branches | Branch name |
+| [docker-build-pr.yml](.github/workflows/docker-build-pr.yml) | Pull requests | `pr-<pr-number>` |
 
 ## Detailed Description
 
@@ -40,17 +40,16 @@ Automatically builds nightly images from the main branch.
 ghcr.io/ohf-voice/linux-voice-assistant:nightly
 ```
 
-### Branch Workflow (`docker-build-branch.yml`)
+### PR Workflow (`docker-build-pr.yml`)
 
-Builds images for all other branches.
+Builds images for pull requests using the PR number as tag.
 
 **Triggers:**
-- Push to all branches except `main`
-- No tags
+- Pull request opened, synchronized, or reopened
 
 **Image Tag:**
 ```
-ghcr.io/ohf-voice/linux-voice-assistant:<branch-name>
+ghcr.io/ohf-voice/linux-voice-assistant:pr-<pr-number>
 ```
 
 ## Multi-Architecture Support

.github/workflows/docker-build-pr.yml

@@ -1,11 +1,8 @@
-name: Build branch
+name: Build PR
 
 on:
-  push:
-    branches-ignore:
-      - "main"
-    tags-ignore:
-      - "**"
+  pull_request:
+    types: [opened, synchronize, reopened]
 
 env:
   REGISTRY: ghcr.io
@@ -23,10 +20,10 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
 
-      - name: Extract clean branch name
-        id: extract_branch
+      - name: Extract PR information
+        id: extract_pr
         run: |
-          echo "CLEAN_BRANCH_NAME=$(echo ${{ github.head_ref || github.ref_name }} | sed 's|.*/||')" >> $GITHUB_ENV
+          echo "PR_NUMBER=${{ github.event.number }}" >> $GITHUB_ENV
           echo "REGISTRY_LOWER=$(echo '${{ env.REGISTRY }}' | tr '[:upper:]' '[:lower:]')" >> $GITHUB_ENV
           echo "REPOSITORY_LOWER=$(echo '${{ github.repository }}' | tr '[:upper:]' '[:lower:]')" >> $GITHUB_ENV
 
@@ -46,7 +43,7 @@ jobs:
 
       - name: Create version files
         run: |
-          echo "${{ env.CLEAN_BRANCH_NAME }}" > version.txt
+          echo "pr-${{ env.PR_NUMBER }}" > version.txt
           echo "${{ github.sha }}" > version_githash.txt
           ls -ltr
 
@@ -58,9 +55,9 @@ jobs:
           platforms: linux/amd64,linux/aarch64
           push: true
           tags: |
-            ${{ env.REGISTRY_LOWER }}/${{ env.REPOSITORY_LOWER }}:${{ env.CLEAN_BRANCH_NAME }}
+            ${{ env.REGISTRY_LOWER }}/${{ env.REPOSITORY_LOWER }}:pr-${{ env.PR_NUMBER }}
           labels: |
-            branch=${{ env.CLEAN_BRANCH_NAME }}
+            pr=${{ env.PR_NUMBER }}
 
       - name: Generate artifact attestation
         uses: actions/attest-build-provenance@v1.4.4