Add missing workflow permissions (#23)

Author: SeanTAllen

.github/workflows/pr.yml

@@ -6,6 +6,9 @@ concurrency:
   group: pr-${{ github.ref }}
   cancel-in-progress: true
 
+permissions:
+  contents: read
+
 jobs:
   lint-entrypoint-py:
     name: Lint entrypoint.py

.github/workflows/update-nightly-image.yml

@@ -13,6 +13,9 @@ concurrency:
   group: "rebuild-nightly-images"
   cancel-in-progress: true
 
+permissions:
+  packages: write
+
 jobs:
   rebuild-public-nightly-image:
     name: Rebuild nightly public image

.github/workflows/update-release-image.yml

@@ -13,6 +13,9 @@ concurrency:
   group: "rebuild-release-images"
   cancel-in-progress: true
 
+permissions:
+  packages: write
+
 jobs:
   rebuild-public-release-image:
     name: Rebuild release public image