add CI tests

Author: MartinPulec

.github/scripts/run_tests.sh

@@ -0,0 +1,73 @@
+#!/bin/sh -eu
+ 
+case "$RUNNER_OS" in
+        Linux)
+                ug_build=UltraGrid-continuous-x86_64.AppImage
+                prepare() {
+                        chmod +x "$ug_build"
+                        ./"$ug_build" --appimage-extract
+                }
+                run=squashfs-root/AppRun
+                ;;
+        Windows)
+                ug_build=UltraGrid-continuous-win64.zip
+                prepare() {
+                        unzip "$ug_build"
+                }
+                run=UltraGrid-continuos-win64/uv.exe
+                ;;
+        macOS)
+                ug_build=UltraGrid-continuous-arm64.dmg
+                prepare() {
+                        hdiutil mount "$ug_build"
+                }
+                run=/Volumes/ULTRAGRID/uv-qt.app/Contents/MacOS/uv
+esac
+
+curl -LOf https://github.com/CESNET/UltraGrid/releases/download/continuous/\
+"$ug_build"
+
+prepare
+
+## used by run_test_data.sh
+## @param $1 args
+## @param $2 timeout
+## @param $3 opts (optional) - should_fail
+add_test() {
+        set --  "$@" "$1" "$2" "${3-}"
+}
+
+. "$(dirname "$0")"/run_test_data.sh
+
+set -e
+while [ $# -ge 3 ]; do
+        args=$1
+        timeout=$2
+        opts=$3
+
+        timeout "$timeout" "$run" "$args"
+        rc=$?
+
+        if [ $rc = 124 ]; then
+                printf "UG with arguments %s timeout (limit: %d sec)!\n" \
+                        "$args" "$timeout"
+                exit 1
+        fi
+
+        if expr -- "$opts" : shoulld_fail; then
+                if [ $rc -eq 0 ]; then
+                        printf "UG with arguments %s should have failed but\
+ returned 0!\n" "$args"
+                        exit 1
+                fi
+        else
+                if [ $rc -ne 0 ]; then
+                        printf "UG with arguments %s returned %d!\n" "$args" "$rc"
+                        exit 1
+                fi
+
+        fi
+
+        shift 3
+done
+

.github/scripts/run_tests_data.sh

@@ -0,0 +1,3 @@
+add_test -v 5 # basic sanity test
+add_test --nonexistent-param 5 should_fail
+

.github/workflows/daily_tests.yml

@@ -0,0 +1,25 @@
+name: Continuous daily build tests
+
+on:
+  push:
+    branches:
+      - run_tests
+  schedule:
+   - cron:  '30 4 * * *' # every day at 4:30 UTC
+
+jobs:
+  run_tests:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+
+    runs-on: ${{ matrix.os }}
+    defaults:
+      run:
+        shell: ${{ matrix.os == 'windows-latest' && 'C:\shells\msys2bash.cmd {0}' || 'bash {0}' }}
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Run
+      shell: bash
+      run: .github/scripts/run_tests.sh