Update CI to test more Android API levels

Author: marcprux

.github/workflows/android.yml

@@ -2,7 +2,7 @@ name: Swift
 on:
   push:
     branches: [ '*' ]
-  #workflow_dispatch:
+  workflow_dispatch:
   pull_request:
 
 jobs:
@@ -19,6 +19,8 @@ jobs:
         arch:
           - 'x86_64'
         sdk:
+          - '26'
+          - '27'
           - '28'
           - '29'
           - '30'