workflows: run staticcheck on more platforms

To prevent issues like #1786, run staticcheck on the primary GOOSes:
linux, mac, and windows.

Windows also has a fair amount of GOARCH-specific code.
If we ever have GOARCH staticcheck failures on other GOOSes,
we can expand the test matrix further.

This requires installing the staticcheck binary so that
we can execute it with different GOOSes.

Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>

.github/workflows/staticcheck.yml

@@ -24,11 +24,23 @@ jobs:
     - name: Run go vet
       run: go vet ./...
 
+    - name: Install staticcheck
+      run: "GOBIN=~/.local/bin go install honnef.co/go/tools/cmd/staticcheck"
+
     - name: Print staticcheck version
-      run: go run honnef.co/go/tools/cmd/staticcheck -version
+      run: "staticcheck -version"
+
+    - name: Run staticcheck (linux/amd64)
+      run: "GOOS=linux GOARCH=amd64 staticcheck -- $(go list ./... | grep -v tempfork)"
+
+    - name: Run staticcheck (darwin/amd64)
+      run: "GOOS=darwin GOARCH=amd64 staticcheck -- $(go list ./... | grep -v tempfork)"
+
+    - name: Run staticcheck (windows/amd64)
+      run: "GOOS=windows GOARCH=amd64 staticcheck -- $(go list ./... | grep -v tempfork)"
 
-    - name: Run staticcheck
-      run: "go run honnef.co/go/tools/cmd/staticcheck -- $(go list ./... | grep -v tempfork)"
+    - name: Run staticcheck (windows/386)
+      run: "GOOS=windows GOARCH=386 staticcheck -- $(go list ./... | grep -v tempfork)"
 
     - uses: k0kubun/action-slack@v2.0.0
       with: