ci: theme-tests workflow; add libarchive dep, use meson test not raw ninja targets

.github/workflows/theme-tests.yml

@@ -0,0 +1,68 @@
+name: Theme Tests
+
+on:
+  push:
+    branches: [master, main]
+    paths:
+      - '.github/workflows/theme-tests.yml'
+      - 'meson.build'
+      - 'meson_options.txt'
+      - 'src/common/**'
+      - 'src/fe-gtk/meson.build'
+      - 'src/fe-gtk/theme/**'
+  pull_request:
+    branches: [master, main]
+    paths:
+      - '.github/workflows/theme-tests.yml'
+      - 'meson.build'
+      - 'meson_options.txt'
+      - 'src/common/**'
+      - 'src/fe-gtk/meson.build'
+      - 'src/fe-gtk/theme/**'
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  theme_tests:
+    runs-on: ubuntu-22.04
+
+    steps:
+      - uses: actions/checkout@v5
+        with:
+          submodules: true
+
+      - name: Install dependencies
+        run: |
+          set -eux
+          sudo apt-get update
+          sudo apt-get install -y --no-install-recommends \
+            build-essential \
+            meson \
+            ninja-build \
+            pkg-config \
+            gettext \
+            libgtk-3-dev \
+            libglib2.0-dev \
+            libdbus-glib-1-dev \
+            libcanberra-dev \
+            libarchive-dev \
+            libssl-dev \
+            xvfb
+
+      - name: Configure
+        run: |
+          set -eux
+          meson setup build-theme-tests \
+            -Dauto_features=disabled \
+            -Dplugin=false \
+            -Dtext-frontend=true
+
+      - name: Run theme tests
+        run: |
+          set -eux
+          xvfb-run -a env NO_AT_BRIDGE=1 GSETTINGS_BACKEND=memory \
+            meson test -C build-theme-tests --print-errorlogs \
+            --timeout-multiplier 2 \
+            'Theme Manager Dispatch Routing Tests'