add ci.yml workflow file

Author: Robbybp

.github/workflows/ci.yml

@@ -0,0 +1,47 @@
+name: CI
+on:
+  push:
+  pull_request:
+  schedule:
+    - cron:  '0 0 * * 3' # on every Wednesday
+jobs:
+  test:
+    if: "!contains(github.event.head_commit.message, 'skip ci')"
+    name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }} - ${{ github.event_name }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        version:
+          - '1.6'
+          - '1'
+        os:
+          - ubuntu-latest
+          - macOS-latest
+          - windows-latest
+        arch:
+          - x64
+    steps:
+      - uses: actions/checkout@v2
+      - uses: julia-actions/setup-julia@v1
+        with:
+          version: ${{ matrix.version }}
+          arch: ${{ matrix.arch }}
+      - uses: actions/cache@v2
+        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-
+            ${{ runner.os }}-
+      - uses: julia-actions/julia-buildpkg@latest
+        continue-on-error: ${{ matrix.version == 'nightly' }}
+      - uses: julia-actions/julia-runtest@latest
+        continue-on-error: ${{ matrix.version == 'nightly' }}
+      - uses: julia-actions/julia-processcoverage@v1
+      - uses: codecov/codecov-action@v1
+        with:
+          file: lcov.info