CI: lower compression ratio in PR build, to save build time

Most of build results from PR are never used, so we can relax
compression levels and reduce build time, for example zip -1
completes typically 3x faster than zip -9.
Note that we do this in common part so post-build test phase
also gets lower compression level.

Signed-off-by: Olev Kartau <olev.kartau@intel.com>

Author: okartau

docker/build-common-util.sh

@@ -36,6 +36,11 @@ EOF
       # save sstate to workspace
       echo "SSTATE_DIR = \"${BUILD_CACHE_DIR}/sstate\"" >> conf/auto.conf
     fi
+    # lower compression levels in a PR build, to save build time
+    if [ -z ${CI_ARCHIVER_MODE+x} ]; then
+        echo "ZIP_COMPRESSION_LEVEL ?= \"-1\"" >> conf/auto.conf
+        echo "XZ_COMPRESSION_LEVEL ?= \"-0\"" >> conf/auto.conf
+    fi
 }
 
 auto_conf_archiver() {