ci: fix backends job logic

Author: mbroz

.gitlab/ci/compilation-clang.gitlab-ci.yml

@@ -43,7 +43,10 @@ test-scan-build-backends:
           "mbedtls"
       ]
   rules:
-      - changes:
+    - if: $CI_PROJECT_PATH != "cryptsetup/cryptsetup"
+      when: never
+    - if: $CI_PIPELINE_SOURCE == "merge_request_event" || $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH || $CI_COMMIT_BRANCH =~ /v2\..\.x$/
+      changes:
         - lib/crypto_backend/*
   script:
     - DEBIAN_FRONTEND=noninteractive apt-get -yq install libgcrypt20-dev libnss3-dev nettle-dev libmbedtls-dev

.gitlab/ci/compilation-gcc.gitlab-ci.yml

@@ -43,7 +43,10 @@ test-gcc-fanalyzer-backends:
           "mbedtls"
       ]
   rules:
-      - changes:
+    - if: $CI_PROJECT_PATH != "cryptsetup/cryptsetup"
+      when: never
+    - if: $CI_PIPELINE_SOURCE == "merge_request_event" || $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH || $CI_COMMIT_BRANCH =~ /v2\..\.x$/
+      changes:
         - lib/crypto_backend/*
   script:
     - DEBIAN_FRONTEND=noninteractive apt-get -yq install libgcrypt20-dev libnss3-dev nettle-dev libmbedtls-dev