feat(ci): push built images to ghcr.io registry

This is a very small step towards WeblateOrg#2589.

.github/bin/get-buildx-args

@@ -64,6 +64,7 @@ else
         esac
     else
         echo --output "type=image,push=false"
+        echo --output "type=image,push=true,name=ghcr.io/weblateorg/weblate-ci:${GITHUB_RUN_ID}"
     fi
 fi
 

.github/workflows/bleeding.yml

@@ -28,6 +28,8 @@ jobs:
       run: echo "date=$(date --iso-8601=ns)" >> $GITHUB_OUTPUT
   build:
     runs-on: ubuntu-22.04
+    permissions:
+      packages: write
     name: Build, bleeding, ${{ matrix.architecture }}
     needs:
     - bleeding
@@ -54,6 +56,8 @@ jobs:
 
   buildx:
     runs-on: ubuntu-22.04
+    permissions:
+      packages: write
     name: Build, bleeding, ${{ matrix.architecture }}
     needs:
     - bleeding

.github/workflows/dockerimage.yml

@@ -18,6 +18,8 @@ permissions:
 jobs:
   build:
     runs-on: ubuntu-22.04
+    permissions:
+      packages: write
     name: Build, stable, ${{ matrix.architecture }}
     strategy:
       matrix:
@@ -40,6 +42,8 @@ jobs:
 
   buildx:
     runs-on: ubuntu-22.04
+    permissions:
+      packages: write
     name: Build, stable, ${{ matrix.architecture }}
     strategy:
       matrix: