Update GitHub Actions workflow to define permissions at the workflow level (#34)

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### Checklist

- [ ] I have read the [contributing
guidelines](https://github.com/httpdss/struct/blob/main/README.md#contributing).
- [ ] My code follows the code style of this project.
- [ ] I have performed a self-review of my own code.
- [ ] I have added tests that prove my fix is effective or that my
feature works.
- [ ] New and existing unit tests pass locally with my changes.
- [ ] I have updated the documentation accordingly.

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Author: httpdss

.github/workflows/generate-terminal-gifs.yaml

@@ -3,16 +3,17 @@ name: generate-terminal-gifs
 on:
   workflow_dispatch:
 
+permissions:
+  contents: write
+  pull-requests: write
+
 jobs:
-  run:
+  run-tapes:
     strategy:
       matrix:
         tapes:
           - 'docs/vhs/install.tape'
     runs-on: ubuntu-latest
-    permissions:
-      contents: write
-      pull-requests: write
     steps:
       - name: Checkout
         uses: actions/checkout@v4

docs/vhs/install.tape

@@ -1,5 +1,5 @@
 
-Output docs/vhs/usage.gif
+Output docs/vhs/install.gif
 
 Set Theme "Monokai Vivid"
 Set FontSize 14