[AIRFLOW-5083] Move image building to before_install for licence (#5695)

scripts/ci/_utils.sh

@@ -173,7 +173,11 @@ function update_all_md5_files() {
     do
         move_file_md5sum "${AIRFLOW_SOURCES}/${FILE}"
     done
-    touch "${BUILD_CACHE_DIR}/.built_${THE_IMAGE}_${PYTHON_VERSION}"
+    local SUFFIX=""
+    if [[ -n ${PYTHON_VERSION:=""} ]]; then
+        SUFFIX="_${PYTHON_VERSION}"
+    fi
+    touch "${BUILD_CACHE_DIR}/.built_${THE_IMAGE}${SUFFIX}"
 }
 
 #

scripts/ci/ci_before_install.sh

@@ -34,8 +34,10 @@ export AIRFLOW_CONTAINER_FORCE_PULL_IMAGES="true"
 # Cleanup docker installation. It should be empty in CI but let's not risk
 docker system prune --all --force
 
-if [[ ${TRAVIS_JOB_NAME} == "Tests"* || ${TRAVIS_JOB_NAME} == "Check license header" ]]; then
+if [[ ${TRAVIS_JOB_NAME} == "Tests"* ]]; then
     rebuild_image_if_needed_for_tests
+elif [[ ${TRAVIS_JOB_NAME} == "Check license header"  ]]; then
+    rebuild_image_for_checklicence
 else
     rebuild_image_if_needed_for_static_checks
 fi

scripts/ci/ci_check_license.sh

@@ -20,6 +20,8 @@ set -uo pipefail
 
 MY_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 
+export PYTHON_VERSION=3.5
+
 # shellcheck source=./_utils.sh
 . "${MY_DIR}/_utils.sh"