Add defaults

Author: ciarams87

.github/workflows/build.yml

@@ -12,9 +12,11 @@ on:
       tag:
         required: false
         type: string
+        default: ''
       dry_run:
         required: false
         type: boolean
+        default: false
 
 defaults:
   run:

.github/workflows/ci.yml

@@ -19,9 +19,11 @@ on:
       release_version:
         required: false
         type: string
+        default: ''
       dry_run:
         required: false
         type: boolean
+        default: false
 
 defaults:
   run:

.github/workflows/conformance.yml

@@ -15,6 +15,7 @@ on:
       production-release:
         required: false
         type: boolean
+        default: false
 
 defaults:
   run: