CI: skip full CI runs on push events

Full CI runs for proposed changes always occur in the PR where the
review is done and patch approved.  Once merged the full CI is run
again using the merged commit.  This is somewhat overkill.  In the
interest of reducing the CI load only run the zloop and checkstyle
workflows which are enough to verify the build on the master branch.
Push events to forks will continue to trigger a full CI run.

Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #18571

.github/workflows/codeql.yml

@@ -11,6 +11,7 @@ concurrency:
 jobs:
   analyze:
     name: Analyze
+    if: github.event_name == 'pull_request' || github.repository != 'openzfs/zfs'
     runs-on: ubuntu-22.04
     permissions:
       actions: read

.github/workflows/smatch.yml

@@ -10,6 +10,7 @@ concurrency:
 
 jobs:
   smatch:
+    if: github.event_name == 'pull_request' || github.repository != 'openzfs/zfs'
     runs-on: ubuntu-24.04
     steps:
     - name: Checkout smatch

.github/workflows/zfs-arm.yml

@@ -14,6 +14,7 @@ on:
 jobs:
   zfs-arm:
     name: ZFS ARM build
+    if: github.event_name == 'pull_request' || github.repository != 'openzfs/zfs'
     runs-on: ubuntu-24.04-arm
     steps:
     - uses: actions/checkout@v6

.github/workflows/zfs-qemu.yml

@@ -23,6 +23,7 @@ concurrency:
 jobs:
   test-config:
     name: Setup
+    if: github.event_name == 'pull_request' || github.repository != 'openzfs/zfs'
     runs-on: ubuntu-24.04
     outputs:
       test_os: ${{ steps.os.outputs.os }}
@@ -94,7 +95,10 @@ jobs:
   qemu-vm:
     name: qemu-x86
     needs: [ test-config ]
-    if: needs.test-config.outputs.ci_type != 'docs'
+    if: >-
+      (github.event_name == 'pull_request' ||
+      github.repository != 'openzfs/zfs') &&
+      needs.test-config.outputs.ci_type != 'docs'
     strategy:
       fail-fast: false
       matrix:
@@ -157,7 +161,10 @@ jobs:
       run: .github/workflows/scripts/qemu-8-summary.sh '${{ steps.artifact-upload.outputs.artifact-url }}'
 
   cleanup:
-    if: always()
+    if: >-
+      (github.event_name == 'pull_request' ||
+      github.repository != 'openzfs/zfs') &&
+      always()
     name: Cleanup
     runs-on: ubuntu-latest
     needs: [ qemu-vm ]