Use GitHub Actions as CI service (#5602)

* ci: migrate to GitHub Actions

* ci: linux-mingw: use lief for parsing PE files

* ci: fix left-over issues with clang-format check

* ci: workaround libc++ issue on macOS

* appveyor: remove build scripts

* README: add GitHub Actions badge and ...

remove Travis CI and Appveyor badges

.ci/linux-frozen/install_package.py

@@ -0,0 +1,52 @@
+#!/usr/bin/python
+
+import sys
+import re
+import subprocess
+from launchpadlib.launchpad import Launchpad
+
+if sys.version_info[0] > 2:
+    xrange = range
+
+cachedir = '/.launchpadlib/cache/'
+launchpad = Launchpad.login_anonymously(
+    'grab build info', 'production', cachedir, version='devel')
+
+processed_packages = []
+deb_file_list = []
+
+
+def get_url(pkg, distro):
+    build_ref = launchpad.archives.getByReference(reference='ubuntu').getPublishedBinaries(
+        binary_name=pkg[0], distro_arch_series='https://api.launchpad.net/devel/ubuntu/' + distro + '/amd64', version=pkg[1], exact_match=True, order_by_date=True).entries[0]
+    build_link = build_ref['build_link']
+    deb_name = '{}_{}_{}.deb'.format(pkg[0], pkg[1], 'amd64' if build_ref['architecture_specific'] else 'all')
+    deb_link = build_link + '/+files/' + deb_name
+    return [deb_link, deb_name]
+
+
+def list_dependencies(deb_file):
+    t = subprocess.check_output(
+        ['bash', '-c', '(dpkg -I {} | grep -oP "^ Depends\: \K.*$") || true'.format(deb_file)])
+    deps = [i.strip() for i in t.split(',')]
+    equals_re = re.compile(r'^(.*) \(= (.*)\)$')
+    return [equals_re.sub(r'\1=\2', i).split('=') for i in filter(equals_re.match, deps)]
+
+
+def get_package(pkg, distro):
+    if pkg in processed_packages:
+        return
+    print('Getting {}...'.format(pkg[0]))
+    url = get_url(pkg, distro)
+    subprocess.check_call(['wget', '--quiet', url[0], '-O', url[1]])
+    for dep in list_dependencies(url[1]):
+        get_package(dep, distro)
+    processed_packages.append(pkg)
+    deb_file_list.append('./' + url[1])
+
+
+for i in xrange(1, len(sys.argv), 3):
+    get_package([sys.argv[i], sys.argv[i + 1]], sys.argv[i + 2])
+
+subprocess.check_call(
+    ['apt-get', 'install', '-y', '--force-yes'] + deb_file_list)