Update trust policy, workflow and README (#15)

- [x] Transfer this to github.com/octo-sts/action
- [x] Merge this PR

Signed-off-by: Matt Moore <mattmoor@chainguard.dev>

.github/chainguard/use-action.sts.yaml

@@ -1,7 +1,7 @@
 issuer: https://token.actions.githubusercontent.com
-subject: repo:chainguard-dev/octo-sts-action:ref:refs/heads/main
+subject: repo:octo-sts/action:ref:refs/heads/main
 claim_pattern:
-  job_workflow_ref: chainguard-dev/octo-sts-action/.github/workflows/use-action.yaml@refs/heads/main
+  job_workflow_ref: octo-sts/action/.github/workflows/use-action.yaml@refs/heads/main
 
 permissions:
   contents: read

.github/workflows/use-action.yaml

@@ -15,9 +15,9 @@ jobs:
 
     steps:
       - id: octo-sts
-        uses: chainguard-dev/octo-sts-action@main
+        uses: octo-sts/action@main
         with:
-          scope: chainguard-dev/octo-sts-action
+          scope: octo-sts/action
           identity: use-action
 
       - uses: actions/checkout@v4

README.md

@@ -10,7 +10,7 @@ permissions:
   id-token: write # Needed to federate tokens.
 
 steps:
-- uses: chainguard-dev/octo-sts-action@main
+- uses: octo-sts/action@main
   id: octo-sts
   with:
     scope: your-org/your-repo