Remove type from custom GitHub action inputs

GitHub actions inputs[1][2] do not support the `type` parameter, only
workflows do[3][4].

[1] https://docs.github.com/en/actions/reference/workflows-and-actions/metadata-syntax#inputs
[2] https://github.com/SchemaStore/schemastore/blob/c3565e40e454c18619aa742d8c061b49febe56a6/src/schemas/json/github-action.json#L345C1-L345C6
[3] https://docs.github.com/en/actions/reference/workflows-and-actions/workflow-syntax
[4] https://github.com/SchemaStore/schemastore/blob/c3565e40e454c18619aa742d8c061b49febe56a6/src/schemas/json/github-workflow.json#L1597

Author: doshitan

.github/actions/build-release-image/action.yml

@@ -4,11 +4,9 @@ description: Builds a docker image and leverages the build cache to re-use cache
 inputs:
   app_name:
     required: true
-    type: string
     description: "name of application folder under infra directory"
   commit_hash:
     required: false
-    type: string
     description: 'The commit hash'
     default: ${{ github.sha }}
 outputs:

.github/actions/first-file/action.yml

@@ -4,7 +4,6 @@ description: Check given list of files in order and return first one that exists
 inputs:
   files:
     required: true
-    type: string
     description: |
       The list of files to check, in the order to check for them.