update regression build

Author: derselbst

.github/workflows/rendering-regression.yml

@@ -6,7 +6,7 @@ on:
       reference_ref:
         description: Git ref (commit/tag) for reference build
         required: false
-        default: HEAD~1
+        default: "v2.4.8"
       snr_min:
         description: Minimum SNR threshold
         required: false
@@ -40,7 +40,8 @@ env:
   SNR_MIN: ${{ github.event.inputs.snr_min || vars.FLUIDSYNTH_REGRESSION_SNR_MIN || '60' }}
   RMS_MAX: ${{ github.event.inputs.rms_max || vars.FLUIDSYNTH_REGRESSION_RMS_MAX || '0.0001' }}
   ABS_MAX: ${{ github.event.inputs.abs_max || vars.FLUIDSYNTH_REGRESSION_ABS_MAX || '0.01' }}
-  REGRESSION_CMAKE_FLAGS: "-DNO_GUI=1 -Denable-network=0"
+  REGRESSION_CMAKE_FLAGS: "-DNO_GUI=1 -Denable-network=0 -DBUILD_SHARED_LIBS=0"
+  ALLOW_MISSING: "1"
 
 jobs:
   audio-regression: