.github/workflows/test_sysinstall.yml: new, test system build and ins…

…tall.

.github/workflows/test_sysinstall.yml

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+name: Test sysinstall
+
+on:
+  schedule:
+    - cron: '13 4 * * *'
+  workflow_dispatch:
+
+jobs:
+
+  sysinstall:
+    name: Test sysinstall
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+
+    steps:
+
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+        with:
+          # 3.12 doesn't have setuptools. As of 2024-01-03, MuPDF build requires setuptools before it
+          # sees `--venv` and defers to a venv, so we currently have to force use of python 3.11.
+          python-version: '3.11'
+
+      - name: sysinstall
+        run:
+          python scripts/sysinstall.py --mupdf-git '--branch master https://github.com/ArtifexSoftware/mupdf.git'