Add Gitea Actions workflow for automated binary releases

Create workflow to build and release pre-built binaries:
- Triggers on git tags (v*) or manual dispatch
- Builds cm-dashboard and cm-dashboard-agent for Linux x86_64
- Creates Gitea release with attached binary files
- Provides tarball for easy distribution

This enables switching from source builds to pre-built binaries
in NixOS configuration for faster rebuilds.

.gitea/workflows/release.yml

@@ -0,0 +1,72 @@
+name: Build and Release
+
+on:
+  push:
+    tags:
+      - 'v*'
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'Version to release (e.g., v0.1.0)'
+        required: true
+        default: 'v0.1.0'
+
+jobs:
+  build-and-release:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Rust
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          profile: minimal
+          override: true
+
+      - name: Install system dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y pkg-config libssl-dev libzmq3-dev
+
+      - name: Build workspace
+        run: |
+          cargo build --release --workspace
+
+      - name: Create release directory
+        run: |
+          mkdir -p release
+          cp target/release/cm-dashboard release/cm-dashboard-linux-x86_64
+          cp target/release/cm-dashboard-agent release/cm-dashboard-agent-linux-x86_64
+
+      - name: Create tarball
+        run: |
+          cd release
+          tar -czf cm-dashboard-linux-x86_64.tar.gz cm-dashboard-linux-x86_64 cm-dashboard-agent-linux-x86_64
+
+      - name: Set version variable
+        id: version
+        run: |
+          if [ "${{ gitea.event_name }}" == "workflow_dispatch" ]; then
+            echo "VERSION=${{ gitea.event.inputs.version }}" >> $GITEA_OUTPUT
+          else
+            echo "VERSION=${GITEA_REF#refs/tags/}" >> $GITEA_OUTPUT
+          fi
+
+      - name: Create Release
+        uses: gitea-actions/release-action@v1
+        with:
+          tag_name: ${{ steps.version.outputs.VERSION }}
+          name: cm-dashboard ${{ steps.version.outputs.VERSION }}
+          body: |
+            ## cm-dashboard ${{ steps.version.outputs.VERSION }}
+            
+            Pre-built binaries for Linux x86_64:
+            - `cm-dashboard-linux-x86_64` - Dashboard TUI binary
+            - `cm-dashboard-agent-linux-x86_64` - Agent daemon binary
+            - `cm-dashboard-linux-x86_64.tar.gz` - Combined tarball
+          files: |
+            release/cm-dashboard-linux-x86_64
+            release/cm-dashboard-agent-linux-x86_64
+            release/cm-dashboard-linux-x86_64.tar.gz