Sync repo to s3

[samjewell]

Add a reusable GitHub Actions workflow to sync repository contents to an S3 bucket, supporting OIDC and IAM authentication.

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[github-actions]

😢 zizmor failed with exit code 14.

Expand for full output

error[unpinned-uses]: unpinned action reference
   --> ./.github/workflows/sync-repo-to-s3.yml:224:9
    |
224 |         uses: aws-actions/configure-aws-credentials@v4
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ action is not pinned to a hash (required by blanket policy)
    |
    = note: audit confidence → High

error[unpinned-uses]: unpinned action reference
   --> ./.github/workflows/sync-repo-to-s3.yml:233:9
    |
233 |         uses: aws-actions/configure-aws-credentials@v4
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ action is not pinned to a hash (required by blanket policy)
    |
    = note: audit confidence → High

161 findings (15 ignored, 144 suppressed): 0 informational, 0 low, 0 medium, 2 high