chore(ci): move prop and prop-grid-rs images to codeberg

Both build workflows now push to codeberg.org/gmcintire/<image>
alongside the runtime base. Login URL is the hardcoded env.REGISTRY
rather than secrets.REGISTRY_URL so a stale/wrong URL secret can't
silently push to the wrong registry.

k8s deployment manifests still reference git.mcintire.me images and
need a follow-up bump to codeberg-side tags after the next CI build
lands an image at codeberg.org.

.forgejo/workflows/build-grid-rs.yaml

@@ -10,9 +10,10 @@ on:
       - 'rust/prop_grid_rs/**'
       - '.forgejo/workflows/build-grid-rs.yaml'
 
+# Hosted on Codeberg's container registry. Same setup as build.yaml.
 env:
-  REGISTRY: git.mcintire.me
-  IMAGE_NAME: graham/prop-grid-rs
+  REGISTRY: codeberg.org
+  IMAGE_NAME: gmcintire/prop-grid-rs
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
@@ -90,7 +91,7 @@ jobs:
           max_attempts=3
           while : ; do
             if echo "${{ secrets.REGISTRY_PASSWORD }}" | \
-                docker login "${{ secrets.REGISTRY_URL }}" \
+                docker login "${{ env.REGISTRY }}" \
                   -u "${{ secrets.REGISTRY_USER }}" \
                   --password-stdin; then
               exit 0

.forgejo/workflows/build.yaml

@@ -5,9 +5,13 @@ on:
     branches:
       - main
 
+# Hosted on Codeberg's container registry. The shared
+# REGISTRY_USER / REGISTRY_PASSWORD secrets carry the Codeberg
+# token; URL is hardcoded so a wrong/missing secrets.REGISTRY_URL
+# can't push to the wrong registry.
 env:
-  REGISTRY: git.mcintire.me
-  IMAGE_NAME: graham/prop
+  REGISTRY: codeberg.org
+  IMAGE_NAME: gmcintire/prop
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
@@ -89,7 +93,7 @@ jobs:
           max_attempts=3
           while : ; do
             if echo "${{ secrets.REGISTRY_PASSWORD }}" | \
-                docker login "${{ secrets.REGISTRY_URL }}" \
+                docker login "${{ env.REGISTRY }}" \
                   -u "${{ secrets.REGISTRY_USER }}" \
                   --password-stdin; then
               exit 0