[ci] Respect gitlab regex syntax.

.gitlab-ci.yml

@@ -145,9 +145,9 @@ eva-domains:
   <<: *eva_domains
   only:
     variables:
-      - $CI_COMMIT_BRANCH =~ /.*[-_/.][Ee]va[-_/.].*/
-      - $CI_COMMIT_BRANCH =~ /^[Ee]va[-_/.].*/
-      - $CI_COMMIT_BRANCH =~ /.*[-_/.][Ee]va$/
+      - $CI_COMMIT_BRANCH =~ /.*[-_\/.][Ee]va[-_\/.].*/
+      - $CI_COMMIT_BRANCH =~ /^[Ee]va[-_\/.].*/
+      - $CI_COMMIT_BRANCH =~ /.*[-_\/.][Ee]va$/
 
 eva-domains-nightly:
   <<: *eva_template