diff --git a/.github/list-subimages b/.github/list-subimages
new file mode 100755
index 0000000..5d0e5ef
--- /dev/null
+++ b/.github/list-subimages
@@ -0,0 +1,36 @@
+#!/usr/bin/python3
+import glob
+import re
+import sys
+import argparse
+
+all_subimages = {re.sub(r"^Dockerfile-", "", dockerfile) for dockerfile in glob.glob("Dockerfile-*")}
+core_subimages = {si for si in all_subimages if si.startswith("core")}
+rest_subimages = all_subimages - core_subimages
+
+
+
+parser = argparse.ArgumentParser(description='List subimages.')
+parser.add_argument('--core', action='store_true',
+                    default=False, help='List core subimages')
+parser.add_argument('--rest', action='store_true',
+                    default=False, help='List rest subimages')
+parser.add_argument('--csv', action='store_true',
+                    default=False, help='Return list as CSV')
+args = parser.parse_args()
+
+
+def list_(subimages):
+    subimages = sorted(subimages)
+    if args.csv:
+        print(",".join(subimages))
+    else:
+        print("\n".join(subimages))
+
+
+if not args.core and not args.rest:
+    list_(core_subimages | rest_subimages)
+if args.core:
+    list_(core_subimages)
+if args.rest:
+    list_(rest_subimages)
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index fbd4c0f..a55343d 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -10,6 +10,17 @@ on:
       - 'test/github-actions'
 
 jobs:
+  generate-matrix:
+    runs-on: ubuntu-latest
+    outputs:
+      core: ${{ steps.step1.outputs.core }}
+      rest: ${{ steps.step1.outputs.rest }}
+    steps:
+      -
+        id: step1
+        run: |
+          echo "core=$(./.github/list-subimages --core --csv)" >>$GITHUB_OUTPUT
+          echo "rest=$(./.github/list-subimages --rest --csv)" >>$GITHUB_OUTPUT
 
   build-core:
     strategy: