Merge PR #276 add/github-workflow

* Commits:
  Add Github workflow for CI tests
  Use common CI test target via Travis
  Consolidate CI test scripts in Makefile

.github/workflows/validate.yml

@@ -0,0 +1,17 @@
+name: validate
+on:
+- push
+- pull_request
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version:
+        - 12
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/setup-node@v1
+      with:
+        node-version: ${{ matrix.node-version }}
+    - run: make validate.ci

.travis.yml

@@ -5,11 +5,6 @@ before_install:
 install:
 - npm ci
 script:
-- make validate-no-uncommitted-package-lock-changes
-- npm run i18n_extract
-- npm run lint -- --max-warnings 0
-- npm run test
-- npm run build
-- npm run is-es5
+- make validate
 after_success:
 - codecov

Makefile

@@ -52,3 +52,18 @@ pull_translations:
 validate-no-uncommitted-package-lock-changes:
 	# Checking for package-lock.json changes...
 	git diff --exit-code package-lock.json
+
+.PHONY: validate
+validate:
+	make validate-no-uncommitted-package-lock-changes
+	npm run i18n_extract
+	npm run lint -- --max-warnings 0
+	npm run test
+	npm run build
+	npm run is-es5
+
+.PHONY: validate.ci
+validate.ci:
+	npm ci
+	make validate
+	codecov