fix(ci): skip slot symlinks in test-core Dockerfile discovery

The current/next/dev slot symlinks under docker/openemr/ were swept into
test-core.yml's matrix discovery, adding redundant Production Docker
(current|next|dev) jobs that rebuilt the same images. The dev slot
(master) then tripped the upstream RootCliGuard check, reddening CI.
Skip symlinked dirs during discovery so only the real version dirs form
the matrix.

Assisted-by: Claude Code

Author: kojiromike

.github/workflows/test-core.yml

@@ -37,12 +37,15 @@ jobs:
       # Use that output as a test matrix in github actions.
       run: |
         shopt -s nullglob
-        dirs=( docker/openemr/*/Dockerfile )
+        dirs=()
+        for f in docker/openemr/*/Dockerfile; do
+          d=${f%/Dockerfile}
+          [ -L "$d" ] || dirs+=( "$d" )
+        done
         if (( "${#dirs[@]}" == 0 )); then
           echo 'No Dockerfiles found in docker/openemr subdirectories.' >&2
           exit 1
         fi
-        dirs=( "${dirs[@]%/Dockerfile}" )
         dirs=( "${dirs[@]#docker/openemr/}" )
         # Use jq to ensure that the output is valid JSON or fail trying.
         # The output (after '=') must be valid JSON for GitHub Actions to use it as a matrix.