attempt to speed up CI

.github/workflows/main.yml

@@ -33,9 +33,12 @@ concurrency:
 
 env:
   CARGO_TERM_COLOR: always
-  CARGO_INCREMENTAL: 0
+  CARGO_INCREMENTAL: "0"
   SCCACHE_GHA_ENABLED: "true"
   RUSTC_WRAPPER: "sccache"
+  SCCACHE_IDLE_TIMEOUT: "0"
+  SCCACHE_GHA_VERSION: "sccache"
+  SCCACHE_BYPASS_CHECK: "on"
 
 jobs:
   check: