Use tmpfs for DBs in gh workflows (#4513)

Author: johha

.github/workflows/unit_tests.yml

@@ -50,6 +50,7 @@ jobs:
         env:
           POSTGRES_PASSWORD: rootpassword
         options: >-
+          --tmpfs /var/lib/postgresql/data:rw,size=2g
           --health-cmd pg_isready
           --health-interval 10s
           --health-timeout 5s
@@ -83,7 +84,12 @@ jobs:
         env:
           MYSQL_DATABASE: cc_test
           MYSQL_ROOT_PASSWORD: password
-        options: --health-cmd="mysqladmin ping" --health-interval=10s --health-timeout=5s --health-retries=3
+        options: >-
+          --tmpfs /var/lib/mysql:rw,size=2g
+          --health-cmd="mysqladmin ping"
+          --health-interval=10s
+          --health-timeout=5s
+          --health-retries=3
         ports:
           - 3306:3306
     steps:

.github/workflows/unit_tests_backwards_compatibility.yml

@@ -40,6 +40,7 @@ jobs:
         env:
           POSTGRES_PASSWORD: rootpassword
         options: >-
+          --tmpfs /var/lib/postgresql/data:rw,size=2g
           --health-cmd pg_isready
           --health-interval 10s
           --health-timeout 5s
@@ -92,7 +93,12 @@ jobs:
         env:
           MYSQL_DATABASE: cc_test
           MYSQL_ROOT_PASSWORD: password
-        options: --health-cmd="mysqladmin ping" --health-interval=10s --health-timeout=5s --health-retries=3
+        options: >-
+          --tmpfs /var/lib/mysql:rw,size=2g
+          --health-cmd="mysqladmin ping"
+          --health-interval=10s
+          --health-timeout=5s
+          --health-retries=3
         ports:
           - 3306:3306
     steps: