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/common/post-upload.sh

@@ -0,0 +1,28 @@
+#!/bin/bash -ex
+
+# Copy documentation
+cp license.txt "$REV_NAME"
+cp README.md "$REV_NAME"
+
+# Copy cross-platform scripting support
+cp -r dist/scripting "$REV_NAME"
+
+tar $COMPRESSION_FLAGS "$ARCHIVE_NAME" "$REV_NAME"
+
+# Find out what release we are building
+if [ -z $GIT_TAG_NAME ]; then
+    RELEASE_NAME=head
+else
+    RELEASE_NAME=$(echo $GIT_TAG_NAME | cut -d- -f1)
+    if [ "$NAME" = "MinGW build" ]; then
+        RELEASE_NAME="${RELEASE_NAME}-mingw"
+    fi
+fi
+
+mv "$REV_NAME" $RELEASE_NAME
+
+7z a "$REV_NAME.7z" $RELEASE_NAME
+
+# move the compiled archive into the artifacts directory to be uploaded by travis releases
+mv "$ARCHIVE_NAME" artifacts/
+mv "$REV_NAME.7z" artifacts/