allow to perform sub platform release builds.

.github/workflows/release.yml

@@ -14,6 +14,11 @@ on:
         description: 'Skip build (for testing workflow)?'
         required: true
         default: "true"
+      platforms:
+        description: 'List of platforms to build (comma seperated, e.g. "rpi3","rpi4")'
+        required: true
+        default: 'all'
+        type: string
 
 # default read-only permission
 permissions:
@@ -111,7 +116,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        platform: [rpi0, rpi2, rpi3, rpi4, rpi5, tinkerboard, odroid-c2, odroid-c4, odroid-n2, intelnuc, ova, oci_amd64, oci_arm64, oci_arm, generic-aarch64, lxc_amd64, lxc_arm64, lxc_arm]
+        platform: ${{ fromJSON(format('[{0}]', (github.event.inputs.platforms == '' || github.event.inputs.platforms == 'all') && '"rpi0","rpi2","rpi3","rpi4","rpi5","tinkerboard","odroid-c2","odroid-c4","odroid-n2","intelnuc","ova","oci_amd64","oci_arm64","oci_arm","generic-aarch64","lxc_amd64","lxc_arm64","lxc_arm"' || github.event.inputs.platforms)) }}
 
     steps:
       - name: Checkout Code
@@ -330,6 +335,10 @@ jobs:
     name: OCI/Docker Build+Push
     runs-on: ubuntu-22.04
     needs: [release_draft, build]
+    if: github.event_name != 'pull_request' &&
+      ( github.event.inputs.platforms == '' ||
+        github.event.inputs.platforms == 'all' ||
+        contains(github.event.inputs.platforms, 'oci_'))
 
     steps:
       - name: Checkout Code