Attempt to fix travis build

.travis.yml

@@ -9,8 +9,10 @@ arch:
 language: php
 
 services:
-  - mysql
-  - postgresql
+  - if: arch = amd64
+    - [ mysql, postgresql ]
+  - if: arch != amd64
+    - mysql
 
 php:
   - 7.2
@@ -19,10 +21,11 @@ php:
   - nightly
 
 before_script:
-  - psql -c 'DROP DATABASE IF EXISTS test;' -U postgres
-  - psql -c 'create database test;' -U postgres
+  - if: arch = amd64
+    - psql -c 'DROP DATABASE IF EXISTS test;' -U postgres
+    - psql -c 'create database test;' -U postgres
   - mysql -e 'create database IF NOT EXISTS test;'
-  - composer install
+  - composer install --ignore-platform-reqs
 
 script:
   - mkdir -p build/logs

composer.json

@@ -20,7 +20,7 @@
 		"role": "Developer"
 	}],
 	"require": {
-		"php": "^7.2 || 8",
+		"php": "^7.2",
 		"ext-pdo": "*"
 	},
 	"require-dev": {