Skip HostImage actions on PR and merge pushes

The workflow is not a required check (it actually always fails or times
out), so there is no need to run it on branches being evaluated for
merging.

Disable the job that is always timing out if there is no build
error.  The job always runs 6 hours:
https://github.com/google/android-cuttlefish/actions/workflows/host-image-ci.yml

Author: cjreynol

.github/workflows/host-image-ci.yml

@@ -18,7 +18,11 @@
 
 name: HostImage
 
-on: [push]
+on: 
+  push:
+    branches:
+      - main
+      - version-*-dev
 
 jobs:
   build-installer-iso-job:
@@ -43,6 +47,8 @@ jobs:
         path: tools/cuttlefish-host-image-installer/preseed-mini.iso.xz
 
   build-cuttlefish-deb-job:
+    # always timing out, disable job until it is debugged
+    if: false
     uses: ./.github/workflows/reusable-build.yaml
 
   build-metapackage-deb-job: