ci: linter (dagger#182)

* ci: linter

Signed-off-by: Andrea Luzzardi <al@dagger.io>

* lint: environment setup

Signed-off-by: Andrea Luzzardi <al@dagger.io>

---------

Signed-off-by: Andrea Luzzardi <al@dagger.io>

Author: Andrea Luzzardi

.container-use/AGENT.md

@@ -6,6 +6,7 @@ DEVELOPMENT WORKFLOW:
 - Build: Use 'go build -o cu ./cmd/cu' or 'dagger call build --platform=current export --path ./cu'
 - Test: Run 'go test ./...' for all tests, 'go test -short ./...' for unit tests only, or 'go test -count=1 -v ./environment' for integration tests
 - Format: Always run 'go fmt ./...' before committing
+- Lint: Run 'golangci-lint run' to check for linting issues
 - Dependencies: Run 'go mod download' to install dependencies, 'go mod tidy' to clean up
 
 DAGGER MODULE (more details in .dagger/):
@@ -17,11 +18,12 @@ AVAILABLE TOOLS:
 - Docker (for container runtime needed by the tool)
 - Dagger v0.18.11 (matches dagger.json)
 - Git with test user configured (test dependency, NOT for version control)
+- golangci-lint v1.61.0 (Go linter with various checks)
 
 PROJECT STRUCTURE:
 - cmd/cu: Main CLI application entry point
 - environment/: Core environment management logic
 - mcpserver/: MCP (Model Context Protocol) server implementation
 - examples/: Example configurations and usage
 - docs/: Documentation and images
-- .dagger/: Dagger module configuration
+- .dagger/: Dagger module configuration

.container-use/environment.json

@@ -6,6 +6,7 @@
     "curl -fsSL https://get.docker.com | sh",
     "cd /tmp \u0026\u0026 curl -L https://dl.dagger.io/dagger/install.sh | DAGGER_VERSION=v0.18.11 sh \u0026\u0026 cp ./bin/dagger /usr/local/bin/dagger",
     "git config --global user.name \"Test User\"",
-    "git config --global user.email \"test@dagger.com\""
+    "git config --global user.email \"test@dagger.com\"",
+    "curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b /usr/local/bin v1.61.0"
   ]
-}
+}

.dagger/main.go

@@ -86,3 +86,11 @@ func (m *ContainerUse) Test(ctx context.Context,
 		WithExec(args, dagger.ContainerWithExecOpts{ExperimentalPrivilegedNesting: true}).
 		Stdout(ctx)
 }
+
+// Test runs the linter
+func (m *ContainerUse) Lint(ctx context.Context) error {
+	return dag.
+		Golangci().
+		Lint(m.Source, dagger.GolangciLintOpts{}).
+		Assert(ctx)
+}

.github/workflows/lint.yml

@@ -0,0 +1,23 @@
+name: Lint
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  workflow_dispatch:
+
+jobs:
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Run tests
+        uses: dagger/dagger-for-github@8.0.0
+        with:
+          version: "latest"
+          verb: call
+          args: lint

dagger.json

@@ -1,6 +1,6 @@
 {
   "name": "container-use",
-  "engineVersion": "v0.18.11",
+  "engineVersion": "v0.18.12",
   "sdk": {
     "source": "go"
   },
@@ -10,6 +10,11 @@
       "source": "github.com/dagger/dagger/modules/go",
       "pin": "ccb4c2d98bce247d22c6b281126eac0ed7c41071"
     },
+    {
+      "name": "golangci",
+      "source": "github.com/dagger/dagger/modules/golangci",
+      "pin": "a569ec610a25df6c94cfe4bb55be02a8ade11f32"
+    },
     {
       "name": "goreleaser",
       "source": "github.com/act3-ai/dagger/goreleaser",