Add "fast" setup action

.github/workflows/dist-macos-latest.yml

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+name: dist-macos-latest
+
+permissions:
+  contents: write
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+on:
+  workflow_dispatch:
+  pull_request:
+
+jobs:
+  build:
+    name: ${{ matrix.os }} / GHC ${{ matrix.ghc }}
+    runs-on: ${{ matrix.os }}
+    steps:
+      - run: brew install ghcup
+      - run: ghcup install ghc ${{ matrix.ghc }} --set
+      - run: ghcup install cabal latest
+      - run: echo "$HOME/.ghcup/bin" >> "$GITHUB_PATH"
+      - run: ghc --version
+      - run: cabal update
+      - run: cabal install --package-env=. --lib hspec
+      - uses: actions/checkout@v4
+      - name: publish
+        run: |
+          dst=$RUNNER_OS-$ImageOS-$RUNNER_ARCH-ghc-${{ matrix.ghc }}.tar.gz
+          tar -czpf "$dst" ~/.ghcup ~/.local/state/cabal/store
+          gh release create nightly --prerelease || (git tag nightly -f && git push --tags -f)
+          gh release upload nightly "$dst" --clobber
+        # if: github.ref == 'refs/heads/main'
+        env:
+          GH_TOKEN: ${{ github.token }}
+
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+          - macos-latest
+        ghc:
+          - 9.12.2

.github/workflows/dist-ubuntu-22.04.yml

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+name: dist-ubuntu-22.04
+
+permissions:
+  contents: write
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+on:
+  workflow_dispatch:
+  pull_request:
+
+jobs:
+  build:
+    name: ${{ matrix.os }} / GHC ${{ matrix.ghc }}
+    runs-on: ${{ matrix.os }}
+    steps:
+      - run: ghcup rm ghc 9.12.2
+      - run: ghcup rm ghc 9.10.3
+      - run: du -hs /usr/local/.ghcup
+      - run: ghcup list
+      - run: sudo apt-get install libncurses5
+      - run: ghcup install ghc ${{ matrix.ghc }} --set
+      - run: ghc --version
+      - run: cabal update
+      - run: cabal install --package-env=. --lib hspec
+      - uses: actions/checkout@v4
+      - name: publish
+        run: |
+          dst=$RUNNER_OS-$ImageOS-$RUNNER_ARCH-ghc-${{ matrix.ghc }}.tar.gz
+          tar -czpf "$dst" /usr/local/.ghcup ~/.local/state/cabal/store
+          gh release create nightly --prerelease || (git tag nightly -f && git push --tags -f)
+          gh release upload nightly "$dst" --clobber
+        # if: github.ref == 'refs/heads/main'
+        env:
+          GH_TOKEN: ${{ github.token }}
+
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+          - ubuntu-22.04
+        ghc:
+          - 8.0.2
+          - 8.2.2
+          - 8.4.1
+          - 8.4.2
+          - 8.4.3
+          - 8.4.4
+          - 8.6.1
+          - 8.6.2
+          - 8.6.3
+          - 8.6.4
+          - 8.6.5
+          - 8.8.1
+          - 8.8.2
+          - 8.8.3
+          - 8.8.4
+          - 8.10.1
+          - 8.10.2
+          - 8.10.3
+          - 8.10.4
+          - 8.10.5
+          - 8.10.6
+          - 8.10.7
+          - 9.0.1
+          - 9.0.2
+          - 9.2.1
+          - 9.2.2
+          - 9.2.3
+          - 9.2.4
+          - 9.2.5
+          - 9.2.6
+          - 9.2.7
+          - 9.2.8
+          - 9.4.1
+          - 9.4.2
+          - 9.4.3
+          - 9.4.4
+          - 9.4.5
+          - 9.4.6
+          - 9.4.7
+          - 9.4.8
+          - 9.6.1
+          - 9.6.2
+          - 9.6.3
+          - 9.6.4
+          - 9.6.5
+          - 9.6.6
+          - 9.6.7
+          - 9.8.1
+          - 9.8.2
+          - 9.8.4
+          - 9.10.1
+          - 9.10.2
+          - 9.10.3
+          - 9.12.1
+          - 9.12.2

fast/action.yml

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+name: Setup Haskell
+author: Simon Hengel
+
+inputs:
+  ghc-version:
+    required: true
+
+runs:
+  using: composite
+  steps:
+    - shell: bash
+      run: echo "$HOME/.ghcup/bin" >> "$GITHUB_PATH"
+      if: runner.os == 'macOS'
+    - shell: bash
+      run: echo "ImageOS=$ImageOS" >> $GITHUB_ENV
+    - shell: bash
+      run: sudo apt-get update && sudo apt-get install -y libncurses5
+      if: env.ImageOS == 'ubuntu22' && (inputs.ghc-version == '8.0.2' || inputs.ghc-version == '8.2.2')
+    - shell: bash
+      run: rm -rf /usr/local/.ghcup/*
+    - shell: bash
+      run: |
+        dst=$RUNNER_OS-$ImageOS-$RUNNER_ARCH-ghc-${{ inputs.ghc-version }}.tar.gz
+        gh release download nightly --repo hspec/setup-haskell -p "$dst" -O - | sudo tar -xzp -C /
+      env:
+        GH_TOKEN: ${{ github.token }}