add github workflows

.github/workflows/build.yml

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+name: Automated Builds
+
+# slightly adapted from:
+# https://github.com/robbert-vdh/nih-plug/blob/master/.github/workflows/build.yml
+
+on:
+  push:
+    branches:
+      - '**'
+    tags:
+      - '*'
+  pull_request:
+    branches:
+      - master
+
+defaults:
+  run:
+    # This otherwise gets run under dash which does not support brace expansion
+    shell: bash
+
+jobs:
+  # We'll only package the plugins with an entry in bundler.toml
+  package:
+    strategy:
+      matrix:
+        include:
+          - { name: ubuntu-20.04,       os: ubuntu-20.04,   cross-target: '' }
+          - { name: macos-universal,    os: macos-12,       cross-target: aarch64-apple-darwin }
+          - { name: windows,            os: windows-latest, cross-target: '' }
+    name: Package plugin binaries
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Fetch all git history
+        run: git fetch --force --prune --tags --unshallow
+
+      - name: Install dependencies
+        if: startsWith(matrix.os, 'ubuntu')
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y libasound2-dev libgl-dev libjack-dev libx11-xcb-dev  libxcb1-dev libxcb-dri2-0-dev libxcb-icccm4-dev libxcursor-dev libxkbcommon-dev libxcb-shape0-dev libxcb-xfixes0-dev
+
+      - uses: actions/cache@v4
+        # FIXME: Caching `target/` causes the Windows runner to blow up after some time
+        if: startsWith(matrix.os, 'windows')
+        with:
+          path: |
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+          key: ${{ matrix.name }}-${{ matrix.cross-target }}
+      - uses: actions/cache@v4
+        if: "!startsWith(matrix.os, 'windows')"
+        with:
+          path: |
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+            target/
+          key: ${{ matrix.name }}-${{ matrix.cross-target }}
+
+      - name: Set up Rust toolchain
+        # Needed for SIMD
+        uses: dtolnay/rust-toolchain@nightly
+        with:
+          # The macOS AArch64 build is done from an x86_64 macOS CI runner, so
+          # it needs to be cross compiled
+          targets: ${{ matrix.cross-target }}
+      - name: Package all targets from bundler.toml
+        # Instead of hardcoding which targets to build and package, we'll
+        # package everything that's got en entry in the `bundler.toml` file
+        run: |
+          # Building can be sped up by specifying all packages in one go
+          package_args=()
+          for package in $(cargo xtask known-packages); do
+            package_args+=("-p" "$package")
+          done
+
+          runner_name=${{ matrix.name }}
+          if [[ $runner_name = 'macos-universal' ]]; then
+            export MACOSX_DEPLOYMENT_TARGET=10.13
+            cargo xtask bundle-universal "${package_args[@]}" --release
+          else
+            cross_target=${{ matrix.cross-target }}
+            if [[ -n $cross_target ]]; then
+              package_args+=("--target" "$cross_target")
+            fi
+
+            cargo xtask bundle "${package_args[@]}" --release
+          fi
+
+      - name: Determine build archive name
+        run: |
+          # Windows (usually) doesn't like colons in file names
+          echo "ARCHIVE_NAME=DEL2-$(date -u +"%Y-%m-%d-%H%m%S")-${{ matrix.name }}" >> "$GITHUB_ENV"
+      - name: Move all packaged plugin into a directory
+        run: |
+          # GitHub Action strips the top level directory, great, have another one
+          mkdir -p "$ARCHIVE_NAME/$ARCHIVE_NAME"
+          mv target/bundled/* "$ARCHIVE_NAME/$ARCHIVE_NAME"
+      - name: Add an OS-specific readme file with installation instructions
+        run: cp ".github/workflows/readme-${{ runner.os }}.txt" "$ARCHIVE_NAME/$ARCHIVE_NAME/README.txt"
+
+      - name: Upload artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: ${{ env.ARCHIVE_NAME }}
+          path: ${{ env.ARCHIVE_NAME }}
+
+      - name: Zip Release
+        uses: thedoctor0/zip-release@0.7.5
+        if: startsWith(github.ref, 'refs/tags/')
+        with:
+          type: 'zip'
+          directory: ${{ env.ARCHIVE_NAME }}/${{ env.ARCHIVE_NAME }}
+          filename: DEL2-${{  github.ref_name }}-${{ matrix.name }}.zip
+
+      - name: Release
+        uses: softprops/action-gh-release@v2
+        if: startsWith(github.ref, 'refs/tags/')
+        with:
+          files: |
+            ${{ env.ARCHIVE_NAME }}/${{ env.ARCHIVE_NAME }}/*.zip

.github/workflows/readme-Linux.txt

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+To install the VST3 plugin, copy the .vst3 _directory to:
+~/.vst3
+
+To install the CLAP plugin, copy the .clap file to:
+~/.clap
+
+You will need to create these directories yourself it they do not yet exist.
+
+See https://github.com/free-audio/clap#hosts for instructions on how to enable
+CLAP support in your DAW.

.github/workflows/readme-Windows.txt

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+To install the VST3 plugin, copy the .vst3 _directory to:
+C:/Program Files/Common Files/VST3/
+
+To install the CLAP plugin, copy the .clap file to:
+C:/Program Files/Common Files/CLAP/
+
+You will need to create these directories yourself it they do not yet exist.
+
+See https://github.com/free-audio/clap#hosts for instructions on how to enable
+CLAP support in your DAW.

.github/workflows/readme-macOS.txt

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+You may need to disable Gatekeeper on macOS to be able to use the plugins:
+https://disable-gatekeeper.github.io/
+
+---
+
+To install the VST3 plugin, copy the .vst3 bundle to:
+~/Library/Audio/Plug-Ins/VST3
+
+To install the CLAP plugin, copy the .clap bundle to:
+~/Library/Audio/Plug-Ins/CLAP
+
+You will need to create these directories yourself it they do not yet exist.
+
+See https://github.com/free-audio/clap#hosts for instructions on how to enable
+CLAP support in your DAW.