Trying to unify KiCad 5/6 GitHub actions

action.yml

@@ -14,6 +14,10 @@ inputs:
     description: 'The PCB .kicad-pcb board file [default: first *.kicad_pcb found]'
     required: false
     default: '__SCAN__'
+  kicad:
+    description: 'KiCad major version (5 or 6) [default: 6]'
+    required: false
+    default: 6
   schema:
     description: 'The schematic file (.sch) [default: first *.*sch found]'
     required: false
@@ -36,7 +40,7 @@ inputs:
     default: '0'
 runs:
   using: 'docker'
-  image: 'Dockerfile'
+  image: ${{ kicad == 5 && 'Dockerfile_k5' || 'Dockerfile_k6' }}
   args:
     -  -c ${{ inputs.config }}
     -  -d ${{ inputs.dir }}