ci: make jobs faster during pull request testing

With the proliferation of test cases, CI runs tend to become rather long
since we run all tests under valgrind using multiple gcc and Clang
versions each.

In order to speedup the jobs, we tests pull requests under valgrind only
for the most recent GCC and Clang versions and run all tests when the
code hits the master branch.

Closes jow-#66
Signed-off-by: Petr Štetiar <ynezz@true.cz>

.github/workflows/openwrt-ci.yml → .github/workflows/openwrt-ci-master.yml

@@ -1,6 +1,9 @@
-name: OpenWrt CI testing
+name: OpenWrt CI master branch testing
+
+on: push
+  branches:
+    - master
 
-on: [ push, pull_request ]
 env:
   CI_ENABLE_UNIT_TESTING: 1
   CI_TARGET_BUILD_DEPENDS: libnl-tiny ubus uci
@@ -13,7 +16,7 @@ jobs:
     steps:
       - uses: actions/checkout@v2
 
-      - uses: ynezz/gh-actions-openwrt-ci-native@v0.0.1
+      - uses: ynezz/gh-actions-openwrt-ci-native@v0.0.2
 
       - name: Upload build artifacts
         uses: actions/upload-artifact@v2

.github/workflows/openwrt-ci-pull-request.yml

@@ -0,0 +1,55 @@
+name: OpenWrt CI pull request testing
+
+on:
+  push:
+    branches-ignore:
+      - master
+  pull_request:
+
+env:
+  CI_ENABLE_UNIT_TESTING: 1
+  CI_TARGET_BUILD_DEPENDS: libnl-tiny ubus uci
+
+jobs:
+  native_testing:
+    name: Various native checks
+    runs-on: ubuntu-20.04
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: ynezz/gh-actions-openwrt-ci-native@v0.0.2
+        env:
+          CI_GCC_VERSION_LIST: 11
+
+      - name: Upload build artifacts
+        uses: actions/upload-artifact@v2
+        if: failure()
+        with:
+          name: native-build-artifacts
+          if-no-files-found: ignore
+          path: |
+            build/scan
+            tests/cram/**/*.t.err
+
+  sdk_build:
+    name: Build with OpenWrt ${{ matrix.sdk_platform }} SDK (out of tree)
+    runs-on: ubuntu-20.04
+
+    strategy:
+      fail-fast: false
+      matrix:
+        sdk_platform:
+          - ath79-generic
+          - imx6-generic
+          - malta-be
+          - mvebu-cortexa53
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Out of tree build with OpenWrt ${{ matrix.sdk_platform }} SDK
+        uses: ynezz/gh-actions-openwrt-ci-sdk@v0.0.1
+        env:
+          CI_TARGET_SDK_RELEASE: master
+          CI_TARGET_SDK_IMAGE: ${{ matrix.sdk_platform }}