Add CI address sanitizer job

With all of these fixes, it should be possible to run address sanitizer in
the automated tests, with the goal of catching memory leaks in every pull
request.

This requires some workarounds in Docker because it seems that the
available debuginfo package repo for GitHub Actions' Ubuntu 22.04 image
doesn't match exactly the versions available in the main package repo.

.github/workflows/ci.yml

@@ -58,3 +58,61 @@ jobs:
       - name: print-test-log
         if: ${{ failure() }}
         run: cat _build/meson-logs/testlog.txt
+
+  sanitizer:
+    runs-on: ubuntu-22.04
+    steps:
+      - name: install-deps
+        # gtk downgrade is because there is no matching version in ddebs repo
+        # for the latest
+        run: |
+          sudo apt-get update
+          sudo apt-get -y --allow-downgrades install \
+            gir1.2-gtk-3.0=3.24.33-1ubuntu1 \
+            gstreamer1.0-plugins-bad \
+            gstreamer1.0-plugins-good \
+            gstreamer1.0-tools \
+            libc6-dbg \
+            libgstreamer1.0-dev \
+            libgtk-3-0=3.24.33-1ubuntu1 \
+            libgtk-3-dev=3.24.33-1ubuntu1 \
+            libunwind-dev \
+            libxml2-utils \
+            meson \
+            ubuntu-dbgsym-keyring
+
+      - name: install-debug-symbols
+        run: |
+          sudo tee -a "/etc/apt/sources.list.d/ddebs.list" <<EOF
+          deb http://ddebs.ubuntu.com jammy main restricted universe multiverse
+          deb http://ddebs.ubuntu.com jammy-updates main restricted universe multiverse
+          EOF
+          sudo apt-get update
+          sudo apt-get -y install libglib2.0-0-dbgsym libgtk-3-0-dbgsym
+
+      - uses: actions/checkout@v3
+
+      - name: configure
+        run: |
+          meson _build \
+            -Db_sanitize=address \
+            -Dintrospection=false \
+            -Dbocfel=false \
+            -Dfrotz=false \
+            -Dgit=false \
+            -Dnitfol=false \
+            -Dplayer=false
+
+      - name: build
+        run: ASAN_OPTIONS=detect_leaks=0 ninja -C _build
+
+      - name: test
+        run: |
+          G_DEBUG=gc-friendly \
+          G_SLICE=always-malloc \
+          ASAN_OPTIONS=fast_unwind_on_malloc=0 \
+            xvfb-run -a meson test -C _build
+
+      - name: print-test-log
+        if: ${{ failure() }}
+        run: cat _build/meson-logs/testlog.txt