add separate annotation-warnings step

see 2908d82845/src/Runner.Worker/Handlers/OutputManager.cs (L320)
see https://github.com/actions/runner/issues/763#issuecomment-1435735340

.github/workflows/check.yml

@@ -65,9 +65,6 @@ jobs:
           curl -SLf https://github.com/irssi-import/actions-irssi/raw/master/check-irssi/render.pl -o ~/render.pl && chmod +x ~/render.pl
       - name: unpack archive
         run: tar xaf artifact/irssi-*.tar.gz
-      - name: Setup local annotations
-        if: ${{ github.event_name == 'pull_request' }}
-        uses: irssi-import/actions-irssi/problem-matchers@master
       - name: build and install with meson
         run: |
           # ninja install
@@ -107,3 +104,55 @@ jobs:
           ^quit' > irssi-test/startup
           irssi-build/bin/irssi --home irssi-test | perl -Mutf8 -C ~/render.pl
           cat irc.log.*
+  annotation-warnings:
+    runs-on: ubuntu-latest
+    if: ${{ github.event_name == 'pull_request' }}
+    env:
+      CC: clang
+    steps:
+      - name: prepare required software
+        run: |
+          sudo apt update && sudo apt install $apt_build_deps
+      - uses: actions/checkout@main
+      - name: Setup local annotations
+        uses: irssi-import/actions-irssi/problem-matchers@master
+      - name: set PATH
+        run: |
+          echo "$HOME/.local/bin" >> $GITHUB_PATH
+      - name: prepare required software
+        env:
+          meson_ver: ${{ matrix.meson_ver }}
+          setuptools_ver: ${{ matrix.setuptools_ver }}
+        run: |
+          sudo apt update && sudo apt install $apt_build_deps $apt_build_deps_meson
+          eval "$get_pip_build_deps_meson"
+          curl -SLf https://github.com/irssi-import/actions-irssi/raw/master/check-irssi/render.pl -o ~/render.pl && chmod +x ~/render.pl
+      - name: build and install with meson
+        run: |
+          meson Build $build_options_meson --prefix=${prefix/\~/~}
+          ninja -C Build
+          ninja -C Build install >/dev/null
+      - name: run launch test
+        env:
+          TERM: xterm
+        run: |
+          # automated irssi launch test
+          cd
+          mkdir irssi-test
+          echo 'echo automated irssi launch test
+          ^set settings_autosave off
+          ^set -clear log_close_string
+          ^set -clear log_day_changed
+          ^set -clear log_open_string
+          ^set log_timestamp * 
+          ^window log on
+          load irc
+          load dcc
+          load flood
+          load notifylist
+          load perl
+          load otr
+          load proxy
+          ^quit' > irssi-test/startup
+          irssi-build/bin/irssi --home irssi-test | perl -Mutf8 -C ~/render.pl
+          cat irc.log.*