Switch CI from ponyc nightly back to release (#131)

0.65.0 is out, so the CI workflows that were pointed at nightly ponyc
during the release cycle go back to release ponyc.

Author: SeanTAllen

.github/workflows/generate-documentation.yml

@@ -21,7 +21,7 @@ jobs:
       url: ${{ steps.deployment.outputs.page_url }}
     runs-on: ubuntu-latest
     container:
-      image: ghcr.io/ponylang/library-documentation-action-v2:nightly
+      image: ghcr.io/ponylang/library-documentation-action-v2:release
     steps:
       - name: Checkout
         uses: actions/checkout@v6.0.2

.github/workflows/pr.yml

@@ -21,7 +21,7 @@ jobs:
     name: Test against recent ponyc release on Linux
     runs-on: ubuntu-latest
     container:
-      image: ghcr.io/ponylang/shared-docker-ci-standard-builder-with-openssl-3.6.2:nightly
+      image: ghcr.io/ponylang/shared-docker-ci-standard-builder-with-openssl-3.6.2:release
     steps:
       - uses: actions/checkout@v6.0.2
       - name: Test

.github/workflows/release.yml

@@ -40,7 +40,7 @@ jobs:
     needs:
       - pre-artefact-creation
     container:
-      image: ghcr.io/ponylang/library-documentation-action-v2:nightly
+      image: ghcr.io/ponylang/library-documentation-action-v2:release
     steps:
       - name: Checkout
         uses: actions/checkout@v6.0.2