GH Actions: Enable grind option

This allows to run the script in grind mode to find CI failures that are triggered through e.g. race conditions.

.github/workflows/sitl_tests.yml

@@ -16,4 +16,5 @@ jobs:
       # Build all targets
       run: DONT_RUN=1 make px4_sitl gazebo mavsdk_tests
     - name: Run simulation tests
-      run:  test/mavsdk_tests/mavsdk_test_runner.py --speed-factor 100
+      # Grind configuration: Run ~8 minutes for 35 iterations == close to the 6 hour limit of Github Actions
+      run:  test/mavsdk_tests/mavsdk_test_runner.py --speed-factor 20 --iterations 1 --fail-early

test/mavsdk_tests/CMakeLists.txt

@@ -1,8 +1,9 @@
 cmake_minimum_required(VERSION 3.5.1)
 
-find_package(MAVSDK)
+if(${PX4_BOARD_MODEL} MATCHES "sitl")
+    find_package(MAVSDK QUIET)
 
-if (MAVSDK_FOUND)
+    if (MAVSDK_FOUND)
         add_executable(mavsdk_tests
             test_main.cpp
             autopilot_tester.cpp
@@ -18,4 +19,7 @@ if (MAVSDK_FOUND)
 
         target_compile_options(mavsdk_tests
             PRIVATE -std=c++17 -Wall -Wextra -Werror)
+    else()
+        message("MAVSDK C++ not found, skipping mavsdk_tests build..")
+    endif()
 endif()

test/mavsdk_tests/mavsdk_test_runner.py

@@ -243,12 +243,6 @@ def main():
 
                 returncode = test_runner.wait(group['timeout_min'])
                 was_success = (returncode == 0)
-                print("Test '{}': {}".
-                    format(test, "Success" if was_success else "Fail"))
-                if not was_success:
-                    overall_success = False
-                    if args.fail_early:
-                        break
 
                 if args.gui:
                     returncode = gzclient_runner.stop()
@@ -260,7 +254,16 @@ def main():
                 px4_runner.stop()
                 print("px4 exited with {}".format(returncode))
 
-        if not overall_success and x > 0:
+                # Test run results
+                print("Test '{}': {}".
+                    format(test, "Success" if was_success else "Fail"))
+
+                # Flag it as group test failure, but finish the rest of the test targets
+                if not was_success:
+                    overall_success = False
+
+        # Abort after the full matrix / test group
+        if not overall_success and x > 0 and args.fail_early:
             print("Aborting with a failure in test run %d" % (x + 1))
             sys.exit(0 if overall_success else 1)