Use latest actions/upload-artifact

Re-remove built-in `chmod` commands for `v2`

.github/workflows/test-hosted-runners.yml

@@ -34,7 +34,7 @@ jobs:
         path: artifact
 
     - name: Download artifact
-      uses: actions/download-artifact@v3
+      uses: actions/download-artifact@v4
       with:
           name: github-pages
           path: artifact2

README.md

@@ -2,17 +2,17 @@
 
 A composite Action for packaging and uploading artifact that can be deployed to [GitHub Pages][pages].
 
-# Scope
+## Scope
 
 ⚠️ Official support for building Pages with Actions is in public beta at the moment.
 
-# Usage
+## Usage
 
 See [action.yml](action.yml)
 
 <!-- TODO: document custom workflow -->
 
-# Artifact validation
+## Artifact validation
 
 While using this action is optional, we highly recommend it since it takes care of producing (mostly) valid artifacts.
 
@@ -25,8 +25,48 @@ The [`tar` file][tar] must:
 
 - be under 10GB in size
 - not contain any symbolic or hard links
+- contain only files and directories that all meet the expected minimum [file permissions](#file-permissions)
 
-# Release instructions
+### File permissions
+
+When using this action, ensure that your files have appropriate file permissions.
+At a minimum, GitHub Pages expects:
+- files to have read permission for the current user and the "Others" user role (e.g. `0744`, `0644`, `0444`)
+- directories to have read and execute permissions for the current user and the "Others" user role (e.g. `0755`, `0555`)
+
+Failure to supply adequate permissions will result in a `deployment_perms_error` when attempting to deploy your artifacts to GitHub Pages.
+
+#### Example permissions fix for Linux
+
+```yaml
+steps:
+# ...
+  - name: Fix permissions
+    run: |
+      chmod -c -R +rX "_site/" | while read line; do
+        echo "::warning title=Invalid file permissions automatically fixed::$line"
+      done
+  - name: Upload Pages artifact
+    uses: actions/upload-pages-artifact@v3
+# ...
+```
+
+#### Example permissions fix for Mac
+
+```yaml
+steps:
+# ...
+  - name: Fix permissions
+    run: |
+      chmod -v -R +rX "_site/" | while read line; do
+        echo "::warning title=Invalid file permissions automatically fixed::$line"
+      done
+  - name: Upload Pages artifact
+    uses: actions/upload-pages-artifact@v3
+# ...
+```
+
+## Release instructions
 
 In order to release a new version of this Action:
 
@@ -38,7 +78,7 @@ In order to release a new version of this Action:
 
    ⚠️ Environment approval is required. Check the [Release workflow run list][release-workflow-runs].
 
-# License
+## License
 
 The scripts and documentation in this project are released under the [MIT License](LICENSE).
 
@@ -47,6 +87,6 @@ The scripts and documentation in this project are released under the [MIT Licens
 [release-list]: https://github.com/actions/upload-pages-artifact/releases
 [draft-release]: .github/workflows/draft-release.yml
 [release]: .github/workflows/release.yml
-[release-workflow-runs]: /actions/workflows/release.yml
+[release-workflow-runs]: https://github.com/actions/upload-pages-artifact/actions/workflows/release.yml
 [gzip]: https://en.wikipedia.org/wiki/Gzip
 [tar]: https://en.wikipedia.org/wiki/Tar_(computing)

action.yml

@@ -14,6 +14,10 @@ inputs:
     description: "Duration after which artifact will expire in days."
     required: false
     default: "1"
+outputs:
+  artifact_id:
+    description: "The ID of the artifact that was uploaded."
+    value: ${{ steps.upload-artifact.outputs.artifact-id }}
 runs:
   using: composite
   steps:
@@ -21,9 +25,6 @@ runs:
       shell: sh
       if: runner.os == 'Linux'
       run: |
-        chmod -c -R +rX "$INPUT_PATH" | while read line; do
-          echo "::warning title=Invalid file permissions automatically fixed::$line"
-        done
         tar \
           --dereference --hard-dereference \
           --directory "$INPUT_PATH" \
@@ -39,9 +40,6 @@ runs:
       shell: sh
       if: runner.os == 'macOS'
       run: |
-        chmod -v -R +rX "$INPUT_PATH" | while read line; do
-          echo "::warning title=Invalid file permissions automatically fixed::$line"
-        done
         gtar \
           --dereference --hard-dereference \
           --directory "$INPUT_PATH" \
@@ -69,7 +67,8 @@ runs:
         INPUT_PATH: ${{ inputs.path }}
 
     - name: Upload artifact
-      uses: actions/upload-artifact@v3
+      id: upload-artifact
+      uses: actions/upload-artifact@v4
       with:
         name: ${{ inputs.name }}
         path: ${{ runner.temp }}/artifact.tar