Well, that didn't work, move the d somewhere else.

.gitlab-ci-unix.yml

@@ -273,7 +273,7 @@ spec:
     - .$[[ inputs.os ]]-build
   script:
     - cd src/sbbs3
-    - gmake ${BUILD_FLAGS} all
+    - gmake -d ${BUILD_FLAGS} all
   artifacts:
     name: "sbbs-${OSP}"
     paths:

.gitlab-ci.yml

@@ -24,7 +24,7 @@ include:
       os: 'freebsd'
       platform: 'amd64'
       tagname: 'FreeBSD'
-      build_flags: '-d RELEASE=1'
+      build_flags: 'RELEASE=1'
   - local: '.gitlab-ci-unix.yml'
     inputs:
       os: 'mingw32'