Add CI workflow for test, lint, and build

Excludes CGO packages (krun, propolis-runner) that require
libkrun-devel which is not available on standard runners.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: JAORMX

.github/workflows/ci.yaml

@@ -0,0 +1,72 @@
+# SPDX-FileCopyrightText: Copyright 2025 Stacklok, Inc.
+# SPDX-License-Identifier: Apache-2.0
+
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+permissions:
+  contents: read
+
+env:
+  GO_VERSION: "1.25"
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: ${{ env.GO_VERSION }}
+          cache: true
+
+      - name: Run tests (excluding CGO packages)
+        run: |
+          go test -v -race $(go list ./... | grep -v krun | grep -v propolis-runner)
+
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: ${{ env.GO_VERSION }}
+          cache: true
+
+      - name: Install Task
+        run: |
+          sh -c "$(curl --location https://taskfile.dev/install.sh)" -- -d -b /usr/local/bin
+
+      - name: Run linter
+        run: |
+          task lint
+
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: ${{ env.GO_VERSION }}
+          cache: true
+
+      - name: Verify compilation (pure Go packages)
+        run: |
+          CGO_ENABLED=0 go build $(go list ./... | grep -v krun | grep -v propolis-runner)