[github-actions] enable full logs in expect tests (#5968)

Currently if OpenThread dies with something like VerifyOrDie, we can't
get any logs from GitHub Actions. This enables full logs and uploads
them when expect tests fail, making it easier to diagnose such errors.

.github/workflows/simulation.yml

@@ -276,12 +276,12 @@ jobs:
     - uses: actions/checkout@v2
     - name: Bootstrap
       run: |
-        OT_OPTIONS=-DOT_READLINE=OFF sudo apt-get --no-install-recommends install -y expect ninja-build lcov socat
+        sudo apt-get --no-install-recommends install -y expect ninja-build lcov socat
     - name: Run
       run: |
         ulimit -c unlimited
         ./script/test prepare_coredump_upload
-        OT_OPTIONS=-DOT_TIME_SYNC=ON VIRTUAL_TIME=0 ./script/test build expect
+        OT_OPTIONS='-DOT_TIME_SYNC=ON -DOT_FULL_LOGS=ON -DOT_LOG_OUTPUT=PLATFORM_DEFINED' VIRTUAL_TIME=0 ./script/test build expect
     - name: Copy Shared Libraries
       if: ${{ failure() }}
       run: |
@@ -305,20 +305,7 @@ jobs:
       run: |
         ulimit -c unlimited
         ./script/test prepare_coredump_upload
-        OT_OPTIONS=-DOT_READLINE=OFF VIRTUAL_TIME=0 OT_NODE_TYPE=rcp ./script/test clean build expect
-    - name: Copy Shared Libraries
-      if: ${{ failure() }}
-      run: |
-          ./script/test copy_so_lib
-    - uses: actions/upload-artifact@v2
-      if: ${{ failure() }}
-      with:
-        name: core-expect-rcp
-        path: |
-          ./build/openthread-simulation-1.1/examples/apps/ncp/ot-rcp
-          ./build/openthread-posix-1.1/src/posix/ot-cli
-          ./ot-core-dump/*
-          ./so-lib/*
+        OT_OPTIONS='-DOT_READLINE=OFF -DOT_FULL_LOGS=ON -DOT_LOG_OUTPUT=PLATFORM_DEFINED' VIRTUAL_TIME=0 OT_NODE_TYPE=rcp ./script/test clean build expect
     - name: Generate Coverage
       run: |
         ./script/test generate_coverage gcc
@@ -338,7 +325,7 @@ jobs:
         host ipv6.google.com ::1
         ulimit -c unlimited
         ./script/test prepare_coredump_upload
-        OT_OPTIONS=-DOT_READLINE=OFF OT_NATIVE_IP=1 VIRTUAL_TIME=0 OT_NODE_TYPE=rcp ./script/test clean build expect
+        OT_OPTIONS='-DOT_READLINE=OFF -DOT_FULL_LOGS=ON -DOT_LOG_OUTPUT=PLATFORM_DEFINED' OT_NATIVE_IP=1 VIRTUAL_TIME=0 OT_NODE_TYPE=rcp ./script/test clean build expect
     - name: Copy Shared Libraries
       if: ${{ failure() }}
       run: |
@@ -346,12 +333,17 @@ jobs:
     - uses: actions/upload-artifact@v2
       if: ${{ failure() }}
       with:
-        name: core-expect-tun
+        name: core-expect-posix
         path: |
           ./build/openthread-simulation-1.1/examples/apps/ncp/ot-rcp
           ./build/openthread-posix-1.1/src/posix/ot-cli
           ./ot-core-dump/*
           ./so-lib/*
+    - uses: actions/upload-artifact@v2
+      if: ${{ failure() }}
+      with:
+        name: syslog-expect-posix
+        path: /var/log/syslog
     - name: Generate Coverage
       run: |
         ./script/test generate_coverage gcc