rework: exhaustive, deadcode and gomod check

.github/workflows/go.yaml

@@ -23,6 +23,26 @@ jobs:
         with:
           version: v1.58
           args: --timeout=5m
+
+      - name: ./gomod.sh
+        run: ./gomod.sh
+
+      - name: exhaustive github.com/nishanths/[email protected]
+        run: |
+          go install github.com/nishanths/exhaustive/cmd/[email protected]
+          exhaustive -default-signifies-exhaustive ./...
+    
+      - name: deadcode golang.org/x/tools/cmd/[email protected]
+        run: |
+          go install golang.org/x/tools/cmd/[email protected]
+          output=$(deadcode -test ./...)
+          if [[ -n "$output" ]]; then
+            echo "🚨 Deadcode found:"
+            echo "$output"
+            exit 1
+          else
+            echo "✅ No deadcode found"
+          fi
 
   build:
     runs-on: ubuntu-latest

gomod.sh

@@ -0,0 +1,8 @@
+#! /bin/bash
+set -e
+
+go mod tidy
+git diff --exit-code -- go.mod || (echo "Go file go.mod is dirty, update the file with 'go mod tidy' locally." && exit 1)
+git diff --exit-code -- go.sum || (echo "Go file go.sum is dirty, update the file with 'go mod tidy' locally." && exit 1)
+diff -u go.list <(go list -m all) || (echo "Go dependencies have changed, update the go.list file with 'go list -m all > go.list' locally." && exit 1)
+go mod verify || (echo "One or more Go dependencies failed verification. Either a version is no longer available, or the author or someone else has modified the version so it no longer points to the same code." && exit 1)