fix issue with env variables

.gitlab-ci.yml

-before_script:
-  - mkdir -p ${SCRATCHDIR}/abs/${CI_COMMIT_SHORT_SHA} 
   - cd ${SCRATCHDIR}/abs/${CI_COMMIT_SHORT_SHA} 
 
 stages:
@@ -22,19 +20,19 @@ stages:
 .download-app: &download-app
     stage: download
     script:
-        - cd ${APP_NAME}
+        - cd ${SCRATCHDIR}/abs/${CI_COMMIT_SHORT_SHA}/${APP_NAME}
         - ./download.sh
 
 .compile-app: &compile-app
     stage: compile
     script:
-        - cd ${APP_NAME}
+        - cd ${SCRATCHDIR}/abs/${CI_COMMIT_SHORT_SHA}/${APP_NAME}
         - ./compile.sh occigen-bdw
 
 .run-small: &run-small
     stage: run-small
     script:
-        - cd ${APP_NAME}/testcase_small
+        - cd ${SCRATCHDIR}/abs/${CI_COMMIT_SHORT_SHA}/${APP_NAME}/testcase_small
         - ./prepare.sh occigen-bdw
         - ./run.sh
     when: manual
@@ -42,8 +40,7 @@ stages:
 .validate-small: &validate-small
     stage: validate
     script:
-        - cd ${APP_NAME}/testcase_small
-        - ./prepare.sh occigen-bdw
+        - cd ${SCRATCHDIR}/abs/${CI_COMMIT_SHORT_SHA}/${APP_NAME}/testcase_small
         - ./validate.sh
     when: manual
 
@@ -51,7 +48,8 @@ stages:
 copy-files: 
     stage: prepare-ci
     script:
-        - cp -rip $CI_PROJECT_DIR/. $SCRATCHDIR/abs/$CI_COMMIT_SHORT_SHA 
+        - mkdir -p ${SCRATCHDIR}/abs/${CI_COMMIT_SHORT_SHA} 
+        - cp -rip . $SCRATCHDIR/abs/$CI_COMMIT_SHORT_SHA 
 
 dl-smilei:
     <<: *smilei