diff --git a/.github/workflows/fedora-copr-build.yml b/.github/workflows/fedora-copr-build.yml
index a768089c..b8918c7e 100644
--- a/.github/workflows/fedora-copr-build.yml
+++ b/.github/workflows/fedora-copr-build.yml
@@ -6,26 +6,61 @@ on:
     # See https://docs.github.com/en/actions/reference/events-that-trigger-workflows#schedule
     - cron: "45 0 * * *"
 
-  workflow_dispatch: {}
+  workflow_dispatch:
+    inputs:
+      strategy:
+        description: 'build strategy'
+        required: true
+        type: choice
+        options:
+        - big-merge
+        - pgo
 
 jobs:
+  generate-matrix:
+    runs-on: ubuntu-latest
+    outputs:
+      mymatrix: ${{ steps.set-matrix.outputs.myoutput }}
+    steps:
+    - id: set-matrix
+      run: |
+        BIG_MERGE_CONFIG=$(jq -c <<EOF
+          {
+              "name": "big-merge",
+              "copr_project_tpl": "@fedora-llvm-team/llvm-snapshots-big-merge-YYYYMMDD",
+              "copr_target_project": "@fedora-llvm-team/llvm-snapshots",
+              "clone_url_tpl": "https://src.fedoraproject.org/rpms/PKG.git",
+              "clone_ref": "rawhide"
+          }
+        EOF
+        )
+
+        PGO_CONFIG=$(jq -c <<EOF
+          {
+            "name": "pgo",
+            "copr_project_tpl": "@fedora-llvm-team/llvm-snapshots-pgo-YYYYMMDD",
+            "copr_target_project": "@fedora-llvm-team/llvm-snapshots-pgo",
+            "extra_script_file": "scripts/functions-pgo.sh",
+            "clone_url_tpl": "https://src.fedoraproject.org/forks/kkleine/rpms/PKG.git",
+            "clone_ref": "pgo"
+          }
+        EOF
+        )
+
+        if [[ '${{ inputs.strategy }}' == 'big-merge' ]]; then
+          INCLUDES="[$BIG_MERGE_CONFIG]"
+        elif [[ '${{ inputs.strategy }}' == 'pgo' ]]; then
+          INCLUDES="[$PGO_CONFIG]"
+        else
+          INCLUDES="[$BIG_MERGE_CONFIG, $PGO_CONFIG]"
+        fi
+        echo "myoutput=$(jq -cn --argjson includes "$INCLUDES" '{include:$includes}')" >> $GITHUB_OUTPUT
+
   build-on-copr:
+    needs: generate-matrix
     strategy:
       fail-fast: false
-      matrix:
-        name: [big-merge, pgo]
-        include:
-          - name: big-merge
-            copr_project_tpl: "@fedora-llvm-team/llvm-snapshots-big-merge-YYYYMMDD"
-            copr_target_project: "@fedora-llvm-team/llvm-snapshots"
-            clone_url_tpl: "https://src.fedoraproject.org/rpms/PKG.git"
-            clone_ref: rawhide
-          - name: pgo
-            copr_project_tpl: "@fedora-llvm-team/llvm-snapshots-pgo-YYYYMMDD"
-            copr_target_project: "@fedora-llvm-team/llvm-snapshots-pgo"
-            extra_script_file: "scripts/functions-pgo.sh"
-            clone_url_tpl: "https://src.fedoraproject.org/forks/kkleine/rpms/PKG.git"
-            clone_ref: pgo
+      matrix: ${{fromJson(needs.generate-matrix.outputs.mymatrix)}}
     runs-on: ubuntu-latest
     container: fedora:39
     steps: