Speeding up Phoenix (Elixir) GitHub Action CI

ci.yml

on: push
name: "CI"

env:
  MIX_ENV: test

jobs:
  dependencies:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        elixir: ['1.13.2']
        otp: ['24.1.7']
    steps:
      - name: Cancel previous runs
        uses: styfle/cancel-workflow-action@0.9.0
        with:
          access_token: ${{ github.token }}
      - name: Checkout Github repo
        uses: actions/checkout@v2
      - name: Sets up an Erlang/OTP environment
        uses: erlef/setup-beam@v1
        with:
          elixir-version: ${{ matrix.elixir }}
          otp-version: ${{ matrix.otp }}
      - name: Cache Elixir deps
        id: elixir-deps-cache
        uses: actions/cache@v3
        with:
          path: |
            **/deps
          key: |
            v1-${{ runner.os }}-${{ matrix.otp }}-${{ matrix.elixir }}-elixir-deps-${{ hashFiles('**/mix.lock') }}
          restore-keys: |
            v1-${{ runner.os }}-${{ matrix.otp }}-${{ matrix.elixir }}-elixir-deps-
      - name: Cache Elixir build
        id: elixir-build-cache
        uses: actions/cache@v3
        with:
          path: |
            **/_build
          key: |
            v1-${{ runner.os }}-${{ matrix.otp }}-${{ matrix.elixir }}-elixir-build-${{ hashFiles( '**/lib/**/*.{ex,eex}', '**/config/*.exs', '**/mix.exs' ) }}
          restore-keys: |
            v1-${{ runner.os }}-${{ matrix.otp }}-${{ matrix.elixir }}-elixir-build-${{ hashFiles('**/mix.lock') }}-
            v1-${{ runner.os }}-${{ matrix.otp }}-${{ matrix.elixir }}-elixir-build-
      - name: Install dependencies
        if: steps.elixir-deps-cache.outputs.cache-hit != 'true'
        run: |
          mix local.rebar --force
          mix local.hex --force
          mix deps.get
      - name: Compile dependencies
        if: steps.elixir-deps-cache.outputs.cache-hit != 'true'
        run: |
          mix deps.get
          mix deps.compile
          mix compile --force --warnings-as-errors
  static-code-analysis:
    needs: dependencies
    runs-on: ubuntu-latest
    strategy:
      matrix:
        elixir: ['1.13.2']
        otp: ['24.1.7']
    steps:
      - name: Cancel previous runs
        uses: styfle/cancel-workflow-action@0.9.0
        with:
          access_token: ${{ github.token }}
      - name: Checkout Github repo
        uses: actions/checkout@v2
      - name: Sets up an Erlang/OTP environment
        uses: erlef/setup-beam@v1
        with:
          elixir-version: ${{ matrix.elixir }}
          otp-version: ${{ matrix.otp }}
      - name: Cache Elixir deps
        id: elixir-deps-cache
        uses: actions/cache@v3
        with:
          path: |
            **/deps
          key: |
            v1-${{ runner.os }}-${{ matrix.otp }}-${{ matrix.elixir }}-elixir-deps-${{ hashFiles('**/mix.lock') }}
          restore-keys: |
            v1-${{ runner.os }}-${{ matrix.otp }}-${{ matrix.elixir }}-elixir-deps-
      - name: Cache Elixir build
        id: elixir-build-cache
        uses: actions/cache@v3
        with:
          path: |
            **/_build
          key: |
            v1-${{ runner.os }}-${{ matrix.otp }}-${{ matrix.elixir }}-elixir-build-${{ hashFiles( '**/lib/**/*.{ex,eex}', '**/config/*.exs', '**/mix.exs' ) }}
          restore-keys: |
            v1-${{ runner.os }}-${{ matrix.otp }}-${{ matrix.elixir }}-elixir-build-${{ hashFiles('**/mix.lock') }}-
            v1-${{ runner.os }}-${{ matrix.otp }}-${{ matrix.elixir }}-elixir-build-
      - run: mix format --check-formatted
      - run: mix credo

  mix-test:
    runs-on: ubuntu-latest
    needs: dependencies
    strategy:
      matrix:
        elixir: ['1.13.2']
        otp: ['24.1.7']
    services:
      db:
        image: postgres:14-alpine
        ports: ['5432:5432']
        env:
          POSTGRES_PASSWORD: postgres
    steps:
      - name: Cancel previous runs
        uses: styfle/cancel-workflow-action@0.9.0
        with:
          access_token: ${{ github.token }}
      - name: Checkout Github repo
        uses: actions/checkout@v2
      - name: Sets up an Erlang/OTP environment
        uses: erlef/setup-beam@v1
        with:
          elixir-version: ${{ matrix.elixir }}
          otp-version: ${{ matrix.otp }}
      - name: Cache Elixir deps
        id: elixir-deps-cache
        uses: actions/cache@v3
        with:
          path: |
            **/deps
          key: |
            v1-${{ runner.os }}-${{ matrix.otp }}-${{ matrix.elixir }}-elixir-deps-${{ hashFiles('**/mix.lock') }}
          restore-keys: |
            v1-${{ runner.os }}-${{ matrix.otp }}-${{ matrix.elixir }}-elixir-deps-
      - name: Cache Elixir build
        id: elixir-build-cache
        uses: actions/cache@v3
        with:
          path: |
            **/_build
          key: |
            v1-${{ runner.os }}-${{ matrix.otp }}-${{ matrix.elixir }}-elixir-build-${{ hashFiles( '**/lib/**/*.{ex,eex}', '**/config/*.exs', '**/mix.exs' ) }}
          restore-keys: |
            v1-${{ runner.os }}-${{ matrix.otp }}-${{ matrix.elixir }}-elixir-build-${{ hashFiles('**/mix.lock') }}-
            v1-${{ runner.os }}-${{ matrix.otp }}-${{ matrix.elixir }}-elixir-build-
      - name: Run Tests
        run: mix test