ci: Add permissions to workflows

Author: jpmckinney

.github/workflows/docker.yml

@@ -8,3 +8,5 @@ on:
 jobs:
   docker:
     uses: open-contracting/.github/.github/workflows/docker-django.yml@main
+    permissions:
+      packages: write

.github/workflows/i18n.yml

@@ -6,3 +6,5 @@ on:
 jobs:
   i18n:
     uses: open-contracting/.github/.github/workflows/i18n-django.yml@main
+    permissions:
+      contents: read