Fix CI

The ${{ Env.KO_VERSION }} placeholder appears to be invalid. Instead,
just reference the environment variable normally.

Signed-off-by: Jason Hall <jasonhall@redhat.com>

.github/workflows/kind-e2e-cosigned.yaml

@@ -1,3 +1,17 @@
+# Copyright 2021 The Sigstore Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 name: Cosigned KinD E2E
 
 on:
@@ -46,13 +60,12 @@ jobs:
       KO_VERSION: 0.9.3
 
     steps:
-    - name: Set up Go 1.16.x
-      uses: actions/setup-go@v2
+    - uses: actions/setup-go@v2
       with:
-        go-version: 1.16.x
+        go-version: 1.17.x
 
     - name: Install ko
-      run: GOBIN=/usr/local/bin go install github.com/google/ko@v${{ .Env.KO_VERSION }}
+      run: go install github.com/google/ko@v${KO_VERSION}
 
     - name: Install yq
       uses: mikefarah/yq@master

.github/workflows/tests.yaml

@@ -1,4 +1,3 @@
-#
 # Copyright 2021 The Sigstore Authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -28,7 +27,6 @@ jobs:
     env:
       KO_VERSION: 0.9.3
 
-
     steps:
       - uses: actions/checkout@v2
       # https://github.com/mvdan/github-actions-golang#how-do-i-set-up-caching-between-builds
@@ -51,7 +49,7 @@ jobs:
         with:
           go-version: '1.17.x'
       - name: install ko
-        run: GOBIN=/usr/local/bin go install github.com/google/ko@v${{ .Env.KO_VERSION }}
+        run: go install github.com/google/ko@v${KO_VERSION}
       - name: setup kind cluster
         run: |
           go install sigs.k8s.io/kind@v0.11.1