CI: try a weekly build of core and extensions

.github/workflows/weekly-opensuse.yml

@@ -0,0 +1,42 @@
+name: nightly-opensuse
+
+on:
+  schedule:
+    - cron: "32 11 * * tuesday"
+  workflow_dispatch:
+
+env:
+  BUILDDIR: /build
+  SRCDIR: ${{ github.workspace }}
+  CMAKE_ARGS: |
+    -DKDE_INSTALL_USE_QT_SYS_PATHS=ON
+    -DCMAKE_BUILD_TYPE=Debug
+    -DBUILD_SCHEMA_TESTING=ON
+    -DBUILD_TESTING=ON
+    -DBUILD_APPSTREAM=ON
+    -DBUILD_APPDATA=ON
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    container:
+      image: docker://opensuse/tumbleweed
+      options: --tmpfs /build:rw --user 0:0
+    steps:
+      - name: "prepare git"
+        shell: bash
+        run: zypper --non-interactive in git-core jq curl
+      - name: "prepare source"
+        uses: calamares/actions/generic-checkout@v5
+      - name: "install dependencies"
+        shell: bash
+        run: ./ci/deps-opensuse.sh
+      - name: "build"
+        shell: bash
+        run: ./ci/build.sh
+      - name: "prepare source (extensions)"
+        shell: bash
+        run: git clone https://github.com/calamares/calamares-extensions.git
+      - name: "build (extensions)"
+        shell: bash
+        run: BUILDDIR=/build/extensions SRCDIR=${SRCDIR}/calamares-extensions ./ci/build.sh