dev(ci): complete refactor

Nearly completely replace the original GitHub actions workflow.
Changes:

- Move from `.sh` files in `ci/steps` to steps in the workflow.
- Move from using docker images for environment to manual setup.
- Upgrade nfpm to v2.3.1

BREAKING CHANGE: official arm64 builds no longer support CentOS 7.
If you need to use CentOS 7 on arm64, build `code-server` locally.
For docs, see the yarn/npm section in `docs/install.md`.

ci/build/build-packages.sh

@@ -8,6 +8,12 @@ main() {
   cd "$(dirname "${0}")/../.."
   source ./ci/lib.sh
 
+  # Allow us to override architecture
+  # we use this for our Linux ARM64 cross compile builds
+  if [ "$#" -eq 1 ] && [ "$1" ]; then
+    ARCH=$1
+  fi
+
   mkdir -p release-packages
 
   release_archive