ci(docker-build): temporarily enable Docker builds on PRs

Author: nicomiguelino

.github/workflows/docker-build.yaml

@@ -1,7 +1,7 @@
 name: Docker Image Build
 
 on:
-  push:
+  pull_request:
     branches:
       - master
     paths:
@@ -103,8 +103,7 @@ jobs:
         run: |
           uv run python -m tools.image_builder \
             --build-target=${{ matrix.board }} \
-            --service=${{ matrix.service }} \
-            --push
+            --service=${{ matrix.service }}
 
       - name: Inspect cache after build
         run: |