Fix duplicate builds

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

.gitlab-ci.yml

@@ -18,6 +18,8 @@ build:
     expire_in: 1d
     reports:
       dotenv: job.env
+  rules:
+    - if: "$CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH"
 
 release:
   image: registry.gitlab.com/gitlab-org/release-cli
@@ -38,3 +40,5 @@ release:
           url: "https://git.karaolidis.com/karaolidis/telegraf-clickhouse-plugin/-/jobs/$JOB_ID/artifacts/raw/telegraf-clickhouse-plugin-linux-amd64"
         - name: "telegraf-clickhouse-plugin-linux-arm64"
           url: "https://git.karaolidis.com/karaolidis/telegraf-clickhouse-plugin/-/jobs/$JOB_ID/artifacts/raw/telegraf-clickhouse-plugin-linux-arm64"
+  rules:
+    - if: "$CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH"