CI: kernel: test each subtarget on push events

Test each subtarget on push events to improve testing and to refresh
ccache of each subtarget.

Signed-off-by: Christian Marangi <[email protected]>

.github/workflows/kernel.yml

@@ -54,10 +54,12 @@ jobs:
           TARGETS_SUBTARGETS="$(echo "$ALL_TARGETS" | sort -u -t '/' -k1 | awk '{ print $1 }')"
           TARGETS="$(echo "$ALL_TARGETS" | sort -u -t '/' -k1,1 | awk '{ print $1 }')"
 
-          # On testing non-specific target, skip testing each subtarget
-          if echo "$CHANGED_FILES" | grep -v -q target/linux ||
-            echo "$CHANGED_FILES" | grep -q target/linux/generic; then
-            TARGETS_SUBTARGETS=$TARGETS
+          # On testing non-specific target, skip testing each subtarget if we are testing pr
+          if [ ${{ github.event_name }} != 'push' ]; then
+            if echo "$CHANGED_FILES" | grep -v -q target/linux ||
+              echo "$CHANGED_FILES" | grep -q target/linux/generic; then
+              TARGETS_SUBTARGETS=$TARGETS
+            fi
           fi
 
           JSON_TARGETS_SUBTARGETS='['