Update clair-scanner to v8

https://gitlab.com/gitlab-org/gl-sast/merge_requests/30

doc/ci/examples/sast_docker.md

@@ -26,8 +26,8 @@ sast:container:
     - docker run -p 6060:6060 --link db:postgres -d --name clair arminc/clair-local-scan:v2.0.1
     - apk add -U wget ca-certificates
     - docker pull ${CI_APPLICATION_REPOSITORY}:${CI_APPLICATION_TAG}
-    - wget https://github.com/arminc/clair-scanner/releases/download/v6/clair-scanner_linux_386
-    - mv clair-scanner_linux_386 clair-scanner
+    - wget https://github.com/arminc/clair-scanner/releases/download/v8/clair-scanner_linux_amd64
+    - mv clair-scanner_linux_amd64 clair-scanner
     - chmod +x clair-scanner
     - touch clair-whitelist.yml
     - ./clair-scanner -c http://docker:6060 --ip $(hostname -i) -r gl-sast-container-report.json -l clair.log -w clair-whitelist.yml ${CI_APPLICATION_REPOSITORY}:${CI_APPLICATION_TAG} || true