add release workflow

simplified version of
https://raw.githubusercontent.com/printfn/fend/d6cfe4da146ca7cc654cfed77e55b6e48f040129/.github/workflows/actions.yml

thanks to
https://raw.githubusercontent.com/jkroepke/openvpn-auth-oauth2/177c4600d6501978646289daabbcbe475bed40b5/.github/workflows/ci.yaml
for showing how to add multiarch repos

.github/workflows/release.yml

@@ -0,0 +1,136 @@
+name: Release
+
+on:
+  release:
+    types: [published]
+  push:
+    branches: [workflow-release-test]
+
+env:
+  CARGO_TERM_COLOR: always
+  RUST_MIN_STACK: 16777212
+
+permissions:
+  contents: write
+
+jobs:
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        platform: [ubuntu-latest, macos-latest, windows-latest]
+        include:
+          - platform: ubuntu-latest
+            artifact-path: target/release/sdl
+            artifact-platform-name: linux-x64
+            env-command: ">> $GITHUB_ENV"
+          - platform: macos-latest
+            artifact-path: target/release/sdl
+            artifact-platform-name: macos-x64
+            env-command: ">> $GITHUB_ENV"
+          - platform: windows-latest
+            artifact-path: target/release/sdl.exe
+            artifact-platform-name: windows-x64
+            env-command: "| Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append"
+
+    runs-on: ${{ matrix.platform }}
+
+    timeout-minutes: 60
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Update Rust
+        run: rustup update
+
+      - uses: swatinem/rust-cache@v2
+
+      - name: Install multiarch dependencies (linux-armhf, linux-arm64)
+        if: ${{ matrix.platform == 'ubuntu-latest' }}
+        run: |
+          sudo dpkg --add-architecture armhf
+          sudo dpkg --add-architecture arm64
+          sudo sed -i'' -E 's/^(deb|deb-src) /\1 [arch=amd64,i386] /' /etc/apt/sources.list
+          echo "deb [arch=armhf] http://ports.ubuntu.com/ubuntu-ports/ $(lsb_release -cs) main restricted universe" | sudo tee /etc/apt/sources.list.d/armhf.list
+          echo "deb [arch=armhf] http://ports.ubuntu.com/ubuntu-ports/ $(lsb_release -cs)-security main restricted universe" | sudo tee -a /etc/apt/sources.list.d/armhf.list
+          echo "deb [arch=arm64] http://ports.ubuntu.com/ubuntu-ports/ $(lsb_release -cs) main restricted universe" | sudo tee /etc/apt/sources.list.d/arm64.list
+          echo "deb [arch=arm64] http://ports.ubuntu.com/ubuntu-ports/ $(lsb_release -cs)-security main restricted universe" | sudo tee -a /etc/apt/sources.list.d/arm64.list
+          sudo apt-get update -y
+          sudo apt-get install -yq libssl-dev:armhf libssl-dev:armhf libssl-dev:arm64
+
+      - name: Build, get version
+        run: |
+          cargo run --release --bin sdl -- --help
+          echo "SDL_VERSION=$(cargo metadata --no-deps --format-version 1 | jq -r '.packages | .[0].version')" ${{ matrix.env-command }}
+
+      - name: Upload artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: sdl-${{ env.SDL_VERSION }}-${{ matrix.artifact-platform-name }}
+          path: ${{ matrix.artifact-path }}
+          if-no-files-found: error
+
+      - name: Build (macos-aarch64)
+        if: ${{ matrix.platform == 'macos-latest' }}
+        run: |
+          rustup target add aarch64-apple-darwin
+          cargo build --release --bin sdl --target aarch64-apple-darwin
+
+      - name: Upload artifacts (macos-aarch64)
+        uses: actions/upload-artifact@v4
+        if: ${{ matrix.platform == 'macos-latest' }}
+        with:
+          name: sdl-${{ env.SDL_VERSION }}-macos-aarch64
+          path: target/aarch64-apple-darwin/release/sdl
+          if-no-files-found: error
+
+      - name: Build (linux-armv7-gnueabihf)
+        if: ${{ matrix.platform == 'ubuntu-latest' }}
+        run: |
+          rustup target add armv7-unknown-linux-gnueabihf
+          sudo apt-get install -yq gcc-arm-linux-gnueabihf
+          export CARGO_TARGET_ARMV7_UNKNOWN_LINUX_GNUEABIHF_LINKER=/usr/bin/arm-linux-gnueabihf-gcc
+          export ARMV7_UNKNOWN_LINUX_GNUEABIHF_OPENSSL_LIB_DIR=/usr/lib/arm-linux-gnueabihf
+          export ARMV7_UNKNOWN_LINUX_GNUEABIHF_OPENSSL_INCLUDE_DIR=/usr/include/arm-linux-gnueabihf
+          cargo build --release --bin sdl --target armv7-unknown-linux-gnueabihf
+
+      - name: Upload artifacts (linux-armv7-gnueabihf)
+        uses: actions/upload-artifact@v4
+        if: ${{ matrix.platform == 'ubuntu-latest' }}
+        with:
+          name: sdl-${{ env.SDL_VERSION }}-linux-armv7-gnueabihf
+          path: target/armv7-unknown-linux-gnueabihf/release/sdl
+          if-no-files-found: error
+
+      - name: Build (linux-aarch64-gnu)
+        if: ${{ matrix.platform == 'ubuntu-latest' }}
+        run: |
+          rustup target add aarch64-unknown-linux-gnu
+          sudo apt-get install -yq gcc-aarch64-linux-gnu
+          export CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER=/usr/bin/aarch64-linux-gnu-gcc
+          export AARCH64_UNKNOWN_LINUX_GNU_OPENSSL_LIB_DIR=/usr/lib/aarch64-linux-gnu
+          export AARCH64_UNKNOWN_LINUX_GNU_OPENSSL_INCLUDE_DIR=/usr/include/aarch64-linux-gnu
+          cargo build --release --bin sdl --target aarch64-unknown-linux-gnu
+
+      - name: Upload artifacts (linux-aarch64-gnu)
+        uses: actions/upload-artifact@v4
+        if: ${{ matrix.platform == 'ubuntu-latest' }}
+        with:
+          name: sdl-${{ env.SDL_VERSION }}-linux-aarch64-gnu
+          path: target/aarch64-unknown-linux-gnu/release/sdl
+          if-no-files-found: error
+
+      - name: Build (linux-x86_64-musl)
+        if: ${{ matrix.platform == 'ubuntu-latest' }}
+        run: |
+          rustup target add x86_64-unknown-linux-musl
+          sudo apt-get install -yq musl-tools
+          cargo build --release --bin sdl --target x86_64-unknown-linux-musl
+
+      - name: Upload artifacts (linux-x86_64-musl)
+        uses: actions/upload-artifact@v4
+        if: ${{ matrix.platform == 'ubuntu-latest' }}
+        with:
+          name: sdl-${{ env.SDL_VERSION }}-linux-x64-musl
+          path: target/x86_64-unknown-linux-musl/release/sdl
+          if-no-files-found: error