Set up GitHub Actions for testing (#82)

Co-authored-by: Dilum Aluthge <[email protected]>

.ci/change-uuid.jl

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+using UUIDs
+
+project_filename = joinpath(dirname(@__DIR__), "Project.toml")
+
+write("Project.toml", replace(read("Project.toml", String), r"uuid = .*?\n" =>"uuid = \"$(uuid4())\"\n"))

.github/workflows/ci.yml

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+name: CI
+on:
+  pull_request:
+    branches:
+      - master
+  push:
+    branches:
+      - master
+    tags: '*'
+jobs:
+  test:
+    name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }} - ${{ github.event_name }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        version:
+          - '1.3'
+          - '1' # automatically expands to the latest stable 1.x release of Julia.
+          - 'nightly'
+        os:
+          - ubuntu-latest
+          - macos-latest
+          - windows-latest
+        arch:
+          - x64
+          - x86
+        # 32-bit Julia binaries are not available on macOS
+        exclude:
+          - os: macOS-latest
+            arch: x86
+    steps:
+      - uses: actions/checkout@v2
+      - uses: julia-actions/setup-julia@v1
+        with:
+          version: ${{ matrix.version }}
+          arch: ${{ matrix.arch }}
+      - uses: actions/cache@v1
+        env:
+          cache-name: cache-artifacts
+        with:
+          path: ~/.julia/artifacts
+          key: ${{ runner.os }}-test-${{ env.cache-name }}-${{ hashFiles('**/Project.toml') }}
+          restore-keys: |
+            ${{ runner.os }}-test-${{ env.cache-name }}-
+            ${{ runner.os }}-test-${{ matrix.os }}
+            ${{ runner.os }}-
+      - run: julia --color=yes .ci/change-uuid.jl
+      - uses: julia-actions/julia-buildpkg@v1
+      - uses: julia-actions/julia-runtest@v1
+      - uses: julia-actions/julia-processcoverage@v1
+      - uses: codecov/codecov-action@v1
+        with:
+          file: lcov.info