chore: only ci use sccache (#26774)

ci/docker-run.sh

@@ -44,6 +44,15 @@ ARGS=(
 if [[ -n $CI ]]; then
   # Share the real ~/.cargo between docker containers in CI for speed
   ARGS+=(--volume "$HOME:/home")
+
+  # sccache
+  ARGS+=(
+    --env "RUSTC_WRAPPER=/home/.cargo/bin/sccache"
+    --env AWS_ACCESS_KEY_ID
+    --env AWS_SECRET_ACCESS_KEY
+    --env SCCACHE_BUCKET
+    --env SCCACHE_REGION
+  )
 else
   # Avoid sharing ~/.cargo when building locally to avoid a mixed macOS/Linux
   # ~/.cargo
@@ -83,15 +92,6 @@ ARGS+=(
   --env CRATES_IO_TOKEN
 )
 
-# sccache
-ARGS+=(
-  --env "RUSTC_WRAPPER=/home/.cargo/bin/sccache"
-  --env AWS_ACCESS_KEY_ID
-  --env AWS_SECRET_ACCESS_KEY
-  --env SCCACHE_BUCKET
-  --env SCCACHE_REGION
-)
-
 # Also propagate environment variables needed for codecov
 # https://docs.codecov.io/docs/testing-with-docker#section-codecov-inside-docker
 # We normalize CI to `1`; but codecov expects it to be `true` to detect Buildkite...