ci: update allocation workflow (#18)

Signed-off-by: Weston Steimel <author@code.w.steimel.me.uk>

Author: westonsteimel

.github/workflows/allocate.yaml

@@ -10,8 +10,7 @@ concurrency:
   group: allocate-security-identifiers
   cancel-in-progress: true
 
-permissions:
-  contents: read
+permissions: {}
 
 jobs:
   allocate-security-identifiers:
@@ -31,7 +30,6 @@ jobs:
         run: pip install git+https://github.com/anchore/security-cli
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd #v6.0.2
         with:
-          ssh-key: ${{ secrets.SECURITY_IDENTIFIERS_CI_PUSH_TOKEN }}
           persist-credentials: true
       - name: Allocate security identifiers
         run: anchore-security-cli id allocate --data-path data