don't explicitly login, bump kaniko to 1.8.0

.github/workflows/deploy.yaml

@@ -35,9 +35,6 @@ jobs:
     - uses: google-github-actions/setup-gcloud@v0.6.0
       with:
         project_id: kontaindotme
-    - name: Login to GCR
-      run: |
-        gcloud auth print-access-token | ko login gcr.io --username=oauth2accesstoken --password-stdin
 
     # Deploy and test.
     - run: ./deploy.sh

.ko.yaml

@@ -1,6 +1,6 @@
 baseImageOverrides:
   github.com/imjasonh/kontain.me/cmd/api: gcr.io/buildpacks/builder
   github.com/imjasonh/kontain.me/cmd/buildpack: gcr.io/buildpacks/builder
-  github.com/imjasonh/kontain.me/cmd/kaniko: gcr.io/kaniko-project/executor:v1.6.0-debug
+  github.com/imjasonh/kontain.me/cmd/kaniko: gcr.io/kaniko-project/executor:debug
   github.com/imjasonh/kontain.me/cmd/ko: golang
   github.com/imjasonh/kontain.me/cmd/viz: nixery.dev/graphviz