Experiment with a release workflow

.github/workflows/binary-release.yml

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+name: Binary Release
+
+on:
+  workflow_dispatch:
+    inputs:
+      mlton-version:
+        required: true
+        type: string
+  workflow_call:
+    inputs:
+      mlton-version:
+        required: true
+        type: string
+
+jobs:
+  binary-release:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - runner: "ubuntu-24.04"
+            binary-release-suffix: ""
+          - runner: "macos-13"
+            binary-release-suffix: ""
+          - runner: "macos-14"
+            binary-release-suffix: ""
+          - runner: "windows-2022"
+            binary-release-suffix: ""
+
+    runs-on: ${{ matrix.runner }}
+    env:
+      MLTON_VERSION: ${{ inputs.mlton-version }}
+      MLTON_BINARY_RELEASE_SUFFIX: ${{ matrix.binary-release-suffix }}
+
+    defaults:
+      run:
+        shell: ${{ (startsWith(matrix.runner, 'windows') && 'msys2 {0}') || 'bash' }}
+
+    steps:
+      - name: Download and unpack source release
+        run: |
+          # Download and unpack source release
+          curl -O -L https://github.com/MLton/mlton/releases/download/on-${MLTON_VERSION}-release/mlton-${MLTON_VERSION}.src.tgz
+          tar xzf mlton-${MLTON_VERSION}.src.tgz
+          rm mlton-${MLTON_VERSION}.src.tgz
+          mv mlton-${MLTON_VERSION}/* .
+          rmdir mlton-${MLTON_VERSION}
+
+      - name: Install bootstrap dependencies
+        uses: ./.github/actions/install-bootstrap-dependencies
+        with:
+          runner: ${{ matrix.runner }}
+          install-llvm: false
+
+      - name: Make binary release
+        run: |
+          PATH=$(pwd)/boot/bin:$PATH \
+          make \
+            OLD_MLTON_RUNTIME_ARGS="ram-slop 0.90" \
+            OLD_MLTON_COMPILE_ARGS="" \
+            MLTON_RUNTIME_ARGS="ram-slop 0.90" \
+            MLTON_COMPILE_ARGS="" \
+            make binary-release
+
+      - name: Upload binary release
+        run: gh release upload on-${MLTON_VERSION}-release mlton-${MLTON_VERSION}*.tgz --clobber
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/release.yml

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+name: Release
+
+on:
+  release:
+    types: [published]
+  workflow_dispatch:
+
+jobs:
+  mlton-version:
+    runs-on: ubuntu-24.04
+    outputs:
+      mlton-version: ${{ steps.mlton-version.outputs.mlton-version }}
+    steps:
+      - name: mlton-version
+        id: mlton-version
+        run: |
+          MLTON_VERSION=$( echo '${{ github.ref_name }}' | sed -En 's;on-([0-9]{8})-release;\1;p')
+          if [ -n "${MLTON_VERSION}" ]; then echo "mlton-version=${MLTON_VERSION}" >> "$GITHUB_OUTPUT"; else echo "Unable to determine MLTON_VERSION"; exit 1; fi
+
+  source-release:
+    needs: mlton-version
+    uses: ./.github/workflows/source-release.yml
+    with:
+      mlton-version: ${{ needs.mlton-version.outputs.mlton-version }}
+    secrets: inherit
+
+  binary-release:
+    needs: [mlton-version, source-release]
+    uses: ./.github/workflows/binary-release.yml
+    with:
+      mlton-version: ${{ needs.mlton-version.outputs.mlton-version }}
+    secrets: inherit

.github/workflows/source-release.yml

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+name: Source Release
+
+on:
+  workflow_dispatch:
+    inputs:
+      mlton-version:
+        required: true
+        type: string
+  workflow_call:
+    inputs:
+      mlton-version:
+        required: true
+        type: string
+
+jobs:
+  source-release:
+    runs-on: ubuntu-24.04
+    env:
+      MLTON_VERSION: ${{ inputs.mlton-version }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          ref: on-${{ inputs.mlton-version }}-release
+          fetch-depth: 0
+      - name: Install guide dependencies
+        uses: ./.github/actions/install-guide-dependencies
+      - name: Make source release
+        run: make MLTON_VERSION=${MLTON_VERSION} source-release
+      - name: Upload source release
+        run: gh release upload on-${MLTON_VERSION}-release mlton-${MLTON_VERSION}.src.tgz --clobber
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}