✨ (action.yaml): add read_checksum_token input to allow custom token for aqua update-checksum (#79)

* ✨ (action.yaml): add read_checksum_token input to allow custom token for aqua update-checksum
💡 (action.yaml): update GITHUB_TOKEN environment variable to use read_checksum_token if provided, enhancing flexibility in permissions

* 📝 (action.yaml): update documentation for read_checksum_token input to clarify its behavior and purpose
♻️ (action.yaml): refactor environment variable from GITHUB_TOKEN to AQUA_GITHUB_TOKEN for consistency and clarity in the action's execution context

Author: iwata

action.yaml

@@ -9,17 +9,27 @@ inputs:
   skip_push:
     required: false
     default: false
+  read_checksum_token:
+    required: false
+    default: ''  # When this input is an empty string, it doesn't override `AQUA_GITHUB_TOKEN`.
+    description: |
+      This token overrides `AQUA_GITHUB_TOKEN` to executes `aqua update-checksum`. It must have `contents:read` permission about all repositories
+      in tools managed by `aqua`. This input is useful to fetch checksum from private repositories.
 runs:
   using: composite
   steps:
     - shell: bash
       working-directory: ${{inputs.working_directory}}
       run: aqua update-checksum -deep
       if: inputs.prune != 'true'
+      env:
+        AQUA_GITHUB_TOKEN: ${{ (inputs.read_checksum_token != '') &&  inputs.read_checksum_token || env.AQUA_GITHUB_TOKEN }}
     - shell: bash
       working-directory: ${{inputs.working_directory}}
       run: aqua update-checksum -deep -prune
       if: inputs.prune == 'true'
+      env:
+        AQUA_GITHUB_TOKEN: ${{ (inputs.read_checksum_token != '') &&  inputs.read_checksum_token || env.AQUA_GITHUB_TOKEN }}
 
     - shell: bash
       id: find