ci: add ccache hit-rate warning when < 75%

Github-Pull: bitcoin#32989
Rebased-From: dd1c590

Print the ccache hit-rate for the job using a GitHub annotation if it
was below 75%.

Author: willcl-ark

ci/test/00_setup_env_mac_native.sh

@@ -9,6 +9,7 @@ export LC_ALL=C.UTF-8
 export HOST=x86_64-apple-darwin
 # Homebrew's python@3.12 is marked as externally managed (PEP 668).
 # Therefore, `--break-system-packages` is needed.
+export CONTAINER_NAME="ci_mac_native"  # macos does not use a container, but the env var is needed for logging
 export PIP_PACKAGES="--break-system-packages zmq"
 export GOAL="install"
 export BITCOIN_CONFIG="--with-gui --with-miniupnpc --with-natpmp --enable-reduce-exports"

ci/test/03_test_script.sh

@@ -145,6 +145,12 @@ fi
 bash -c "${MAYBE_BEAR} ${MAYBE_TOKEN} make $MAKEJOBS $GOAL" || ( echo "Build failure. Verbose build follows." && make "$GOAL" V=1 ; false )
 
 bash -c "${PRINT_CCACHE_STATISTICS}"
+if [ "$CI" = "true" ]; then
+  hit_rate=$(ccache -s | grep "Hits:" | head -1 | sed 's/.*(\(.*\)%).*/\1/')
+  if [ "${hit_rate%.*}" -lt 75 ]; then
+      echo "::notice title=low ccache hitrate::Ccache hit-rate in $CONTAINER_NAME was $hit_rate%"
+  fi
+fi
 du -sh "${DEPENDS_DIR}"/*/
 du -sh "${PREVIOUS_RELEASES_DIR}"