docs: update actions and workflows documentation

[skip ci]

Signed-off-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: hoverkraft-bot[bot]

.github/workflows/docker-build-images.md

@@ -51,12 +51,7 @@ permissions: {}
 jobs:
   docker-build-images:
     uses: hoverkraft-tech/ci-github-container/.github/workflows/docker-build-images.yml@0d92511a38c93e30ae0f8b82346116946987a9ca # 0.30.0
-    permissions:
-      contents: read
-      issues: read
-      packages: write
-      pull-requests: read
-      id-token: write
+    permissions: {}
     secrets:
       # Password or GitHub token (`packages:read` and `packages:write` scopes) used to log against the OCI registry.
       # See https://github.com/docker/login-action#usage.

.github/workflows/prune-pull-requests-images-tags.md

@@ -49,11 +49,7 @@ permissions: {}
 jobs:
   prune-pull-requests-images-tags:
     uses: hoverkraft-tech/ci-github-container/.github/workflows/prune-pull-requests-images-tags.yml@0d92511a38c93e30ae0f8b82346116946987a9ca # 0.30.0
-    permissions:
-      contents: read
-      pull-requests: read
-      packages: write
-      id-token: write
+    permissions: {}
     with:
       # JSON array of runner(s) to use.
       # See https://docs.github.com/en/actions/using-jobs/choosing-the-runner-for-a-job.