ci: update ci publish permissions + requirements

Author: spwoodcock

.github/workflows/release_chart.yml

@@ -5,6 +5,7 @@ on:
     types: [published]
 
 permissions:
+  contents: read
   packages: write
 
 jobs:

.github/workflows/release_image.yml

@@ -19,10 +19,12 @@ jobs:
         id: set_repo
         run: |
           repo=$(echo "$GITHUB_REPOSITORY" | tr '[:upper:]' '[:lower:]')
+          echo "Lowercase repo: $repo"
           echo "repo=$repo" >> "$GITHUB_OUTPUT"
 
   container-img:
     uses: hotosm/gh-workflows/.github/workflows/image_build.yml@2.0.5
+    needs: prep
     with:
       build_target: release
       image_name: ghcr.io/${{ needs.prep.outputs.repo }}