Add scrutinizer config with multiple php versions

* The default tests block runs unit tests against the latest version, ie 8.0.
* The php* nodes repeat unit tests against earlier PHP versions.
* The coverage and analysis nodes look after the other scrutinizer responsibilities.

Author: cmbuckley

.gitattributes

@@ -2,6 +2,7 @@
 /.gitattributes export-ignore
 /.github export-ignore
 /.gitignore export-ignore
+/.scrutinizer.yml export-ignore
 /.styleci.yml export-ignore
 /.travis.yml export-ignore
 /phpunit.xml.dist export-ignore

.scrutinizer.yml

@@ -0,0 +1,35 @@
+filter:
+  excluded_paths:
+    - 'tests/*'
+checks:
+  php: true
+build:
+  nodes:
+    php71:
+      environment:
+        php: 7.1
+    php72:
+      environment:
+        php: 7.2
+    php73:
+      environment:
+        php: 7.3
+    php74:
+      environment:
+        php: 7.4
+    coverage:
+      tests:
+        override:
+          - command: 'XDEBUG_MODE=coverage vendor/bin/phpunit --coverage-clover=phpunit-coverage.xml'
+            coverage:
+              file: 'phpunit-coverage.xml'
+              format: 'php-clover'
+    analysis:
+      tests:
+        override:
+          - command: phpcs-run
+            use_website_config: true
+          - php-scrutinizer-run
+  tests:
+    override:
+      - command: 'vendor/bin/phpunit'