feat: Add CI and Release workflows for automated markdown linting, formatting checks, and deployment

.github/workflows/ci.yml

@@ -0,0 +1,87 @@
+name: CI
+
+on:
+  push:
+    branches: [master, dev]
+  pull_request:
+    branches: [master, dev]
+  workflow_dispatch:
+
+jobs:
+  lint-markdown:
+    name: Markdown Lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Run markdownlint
+        run: bash scripts/lint-markdown.sh
+
+  format-check:
+    name: Format Check
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup .NET 10
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: '10.0.x'
+
+      - name: Check formatting
+        run: dotnet format src/EchoHub.slnx --verify-no-changes --verbosity diagnostic
+
+  build-and-test:
+    name: Build & Test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Check for src/ changes
+        id: changes
+        env:
+          EVENT: ${{ github.event_name }}
+          BEFORE: ${{ github.event.before }}
+          BASE_REF: ${{ github.base_ref }}
+        run: |
+          if [ "$EVENT" = "pull_request" ]; then
+            git fetch origin "$BASE_REF" --depth=1
+            CHANGED=$(git diff --name-only "origin/$BASE_REF"...HEAD -- 'src/' | wc -l)
+          elif [ -z "$BEFORE" ] || [ "$BEFORE" = "0000000000000000000000000000000000000000" ]; then
+            CHANGED=1
+          else
+            CHANGED=$(git diff --name-only "$BEFORE" HEAD -- 'src/' | wc -l)
+          fi
+          [ "$CHANGED" -gt 0 ] && echo "src_changed=true" >> "$GITHUB_OUTPUT" || echo "src_changed=false" >> "$GITHUB_OUTPUT"
+
+      - name: Setup .NET 10
+        if: steps.changes.outputs.src_changed == 'true'
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: '10.0.x'
+
+      - name: Cache NuGet packages
+        if: steps.changes.outputs.src_changed == 'true'
+        uses: actions/cache@v4
+        with:
+          path: ~/.nuget/packages
+          key: nuget-${{ runner.os }}-${{ hashFiles('src/**/*.csproj') }}
+          restore-keys: nuget-${{ runner.os }}-
+
+      - name: Restore dependencies
+        if: steps.changes.outputs.src_changed == 'true'
+        run: dotnet restore src/EchoHub.slnx
+
+      - name: Build
+        if: steps.changes.outputs.src_changed == 'true'
+        run: dotnet build src/EchoHub.slnx --no-restore --configuration Release
+
+      - name: Test
+        if: steps.changes.outputs.src_changed == 'true'
+        run: dotnet test src/EchoHub.slnx --no-build --configuration Release --verbosity normal
+
+      - name: Skip notice
+        if: steps.changes.outputs.src_changed == 'false'
+        run: echo "No changes in src/ — skipping build and test"