use latest release, use main in tests

Author: imjasonh

.github/workflows/use-action.yaml

@@ -19,18 +19,18 @@ jobs:
       - uses: actions/checkout@v2
 
       # Minimal publish
-      - uses: imjasonh/setup-ko@v0.2
+      - uses: imjasonh/setup-ko@main
       - run: ko publish --bare ./
 
       # Install an old release.
-      - uses: imjasonh/setup-ko@v0.2
+      - uses: imjasonh/setup-ko@main
         with:
           version: v0.8.0
       - name: Check installed version
         run: ko version | grep 0.8.0
 
       # Install from tip
-      - uses: imjasonh/setup-ko@v0.2
+      - uses: imjasonh/setup-ko@main
         with:
           version: tip
       - name: Check installed version (tip)

action.yml

@@ -23,7 +23,7 @@ runs:
         go get github.com/google/ko@main
         ;;
       latest-release)
-        tag=$(curl -s https://api.github.com/repos/google/ko/releases | jq -r '.[].tag_name' | head -n 1)
+        tag=$(curl -s https://api.github.com/repos/google/ko/releases/latest | jq -r '.tag_name')
         ;;
       *)
         tag="${{ inputs.version }}"