handle CI rustc incompatible runners

Signed-off-by: onur-ozkan <work@onurozkan.dev>

Author: onur-ozkan

src/ci/docker/run.sh

@@ -343,6 +343,7 @@ docker \
  --env PR_CI_JOB \
  --env OBJDIR_ON_HOST="$objdir" \
  --env CODEGEN_BACKENDS \
+ --env DISABLE_CI_RUSTC_IF_INCOMPATIBLE="$DISABLE_CI_RUSTC_IF_INCOMPATIBLE" \
  --init \
  --rm \
  rust-ci \

src/ci/run.sh

@@ -52,6 +52,11 @@ if [ "$CI" != "" ]; then
  RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --set change-id=99999999"
 fi
 
+# If runner uses an incompatible option and `FORCE_CI_RUSTC` is not defined, switch to in-tree rustc.
+if [ "$FORCE_CI_RUSTC" == "" ]; then
+ DISABLE_CI_RUSTC_IF_INCOMPATIBLE=1
+fi
+
 if ! isCI || isCiBranch auto || isCiBranch beta || isCiBranch try || isCiBranch try-perf || \
  isCiBranch automation/bors/try; then
  RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --set build.print-step-timings --enable-verbose-tests"