Specify bash shell for all CI workflow steps

Author: daniel-sullivan

.github/workflows/ci.yml

@@ -27,13 +27,16 @@ jobs:
           go-version-file: go.mod
 
       - name: Run tests with race detector and coverage
+        shell: bash
         run: go test -v -short -race -coverprofile=coverage.out -covermode=atomic -count=1 ./...
 
       - name: Print coverage summary
         if: success()
+        shell: bash
         run: go tool cover -func=coverage.out
 
       - name: Vet
+        shell: bash
         run: go vet ./...
 
       - name: Upload coverage