try to debug macos-latest issue

.github/workflows/use-action.yaml

@@ -19,18 +19,18 @@ jobs:
       - uses: actions/checkout@v2
 
       # Minimal publish
-      - uses: imjasonh/setup-ko@v0.3
+      - uses: imjasonh/setup-ko@main
       - run: ko publish --bare ./
 
       # Install an old release.
-      - uses: imjasonh/setup-ko@v0.3
+      - 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@v0.3
+      - uses: imjasonh/setup-ko@main
         with:
           version: tip
       - name: Check installed version (tip)

action.yml

@@ -13,6 +13,8 @@ runs:
   steps:
   - shell: bash
     run: |
+      set -ex
+
       # Install ko:
       # - if version is "tip", install from tip of main.
       # - if version is "latest-release", look up latest release.