Added gh action for releasing

.github/workflows/release_on_tag.yaml

@@ -0,0 +1,71 @@
+on:
+  push:
+    # Sequence of patterns matched against refs/tags
+    tags:
+      - 'v*' # Push events to matching v*, i.e. v1.0, v20.15.10
+
+name: Create Release
+
+jobs:
+  create_release:
+    name: Create Release
+    runs-on: ubuntu-latest
+    outputs:
+      upload_url: ${{ steps.create_release.outputs.upload_url }}
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+      - name: Create Release
+        id: create_release
+        uses: actions/create-release@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} # This token is provided by Actions, you do not need to create your own token
+        with:
+          tag_name: ${{ github.ref }}
+          release_name: DNS-Ear ${{ github.ref }}
+          body: ''
+          draft: false
+          prerelease: false
+
+  cross_compile:
+    name: Cross Compile
+    runs-on: ubuntu-latest
+    needs:
+      - create_release
+    strategy:
+      matrix:
+        target:
+          - os: i686-unknown-linux-gnu
+            binary: dns-ear
+          - os: x86_64-pc-windows-gnu
+            binary: dns-ear.exe
+          - os: x86_64-unknown-linux-gnu
+            binary: dns-ear
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          target: ${{ matrix.target.os }}
+          override: true
+      - uses: actions-rs/cargo@v1
+        with:
+          use-cross: true
+          command: build
+          args: --release --target=${{ matrix.target.os }}
+      - name: Compress
+        shell: bash
+        run: |
+          ls -l
+          echo 'target' && ls -l target
+          echo 'release' && ls -l target/release
+          zip --junk-paths -r dns-ear.zip target/${{ matrix.target.os }}/release/${{ matrix.target.binary }}
+      - name: Upload
+        uses: actions/upload-release-asset@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          upload_url: ${{ needs.create_release.outputs.upload_url }}
+          asset_path: dns-ear.zip
+          asset_name: dns-ear-${{ matrix.target.os }}.zip
+          asset_content_type: application/zip