ci: use github actions instead of travis

.github/workflows/angular.yml

@@ -0,0 +1,56 @@
+on:
+  push:
+    branches: [ "next" ]
+  pull_request:
+    branches: [ "next" ]
+
+env:
+  NODE_JS_VERSION: 12
+
+jobs:
+  install-deps:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - run: yarn --frozen-lockfile
+      - uses: actions/setup-node@v3
+        with:
+          node-version: ${{env.NODE_JS_VERSION}}
+          cache: 'yarn'
+      - uses: actions/cache@v3
+        with:
+          key: node_modules-${{ runner.os }}-${{ hashFiles('yarn.lock') }}
+          path: node_modules
+
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v3
+        with:
+          node-version: ${{env.NODE_JS_VERSION}}
+          cache: 'yarn'
+      - uses: actions/cache@v3
+        with:
+          key: node_modules-${{ runner.os }}-${{ hashFiles('yarn.lock') }}
+          path: node_modules
+      - run: yarn --frozen-lockfile
+      - run: yarn lint
+    needs: [install-deps]
+
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v3
+        with:
+          node-version: ${{env.NODE_JS_VERSION}}
+          cache: 'yarn'
+      - uses: actions/cache@v3
+        with:
+          key: node_modules-${{ runner.os }}-${{ hashFiles('yarn.lock') }}
+          path: node_modules
+      - run: yarn --frozen-lockfile
+      - run: yarn build:lib
+      - run: yarn build:demo --base-href "/ngx-openlayers/" --progress false
+    needs: [install-deps]