switch to circleci

.circleci/config.yml

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+defaults: &defaults
+  steps:
+    # common php steps
+    - run: echo "http://dl-cdn.alpinelinux.org/alpine/edge/community" >> /etc/apk/repositories
+    - run: echo "date.timezone = UTC" >> $(php --ini |grep Scan |awk '{print $NF}')/timezone.ini
+    - run: curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/bin --filename=composer
+
+    # install apcu
+    - run: |
+        docker-php-source extract \
+        && apk add --no-cache --virtual .phpize-deps-configure $PHPIZE_DEPS \
+        && printf "\n" | pecl install apcu \
+        && docker-php-ext-enable apcu \
+        && apk del .phpize-deps-configure \
+        && docker-php-source delete
+
+    # checkout
+    - checkout
+
+    # post-checkout steps
+
+    # run tests
+    - run: composer install -n --prefer-dist
+    - run: php vendor/phpunit/phpunit/phpunit -c phpunit.xml --log-junit /tmp/test-results/phpunit/junit.xml
+    - store_test_results:
+        path: /tmp/test-results
+
+version: 2
+jobs:
+  build-php71:
+    <<: *defaults
+    docker:
+      - image: php:7.1-alpine
+  build-php72:
+    <<: *defaults
+    docker:
+      - image: php:7.2-alpine
+  build-php73:
+    <<: *defaults
+    docker:
+      - image: php:7.3-alpine
+  build-phpRC:
+    <<: *defaults
+    docker:
+      - image: php:rc-alpine
+
+workflows:
+  version: 2
+  build:
+    jobs:
+      - build-php71
+      - build-php72
+      - build-php73
+      - build-phpRC