build(lapis): use files relative to rootDir when building openapi specs

The openapi gradle plugin changed the working dir from project root to a temp dir in build/:
springdoc/springdoc-openapi-gradle-plugin#142

Author: fengelniederhammer

lapis/build.gradle

@@ -94,15 +94,17 @@ openApi {
         if (segmented_ == "true") {
             return "../lapis-e2e/testData/multiSegmented/testDatabaseConfig.yaml"
         } else {
-            return opennessLevel_ == "open" ? "../lapis-e2e/testData/singleSegmented/testDatabaseConfig.yaml" : "../lapis-e2e/testData/singleSegmented/protectedTestDatabaseConfig.yaml"
+            return opennessLevel_ == "open"
+                    ? "$rootDir/../lapis-e2e/testData/singleSegmented/testDatabaseConfig.yaml"
+                    : "$rootDir/../lapis-e2e/testData/singleSegmented/protectedTestDatabaseConfig.yaml"
         }
     }
 
     def getReferenceGenomeFilename = { segmented_ ->
         if (segmented_ == "true") {
-            return "../lapis-e2e/testData/multiSegmented/reference_genomes.json"
+            return "$rootDir/../lapis-e2e/testData/multiSegmented/reference_genomes.json"
         } else {
-            return "../lapis-e2e/testData/singleSegmented/reference_genomes.json"
+            return "$rootDir/../lapis-e2e/testData/singleSegmented/reference_genomes.json"
         }
     }
 
@@ -118,7 +120,7 @@ openApi {
                 "--silo.url=does.not.matter.here",
                 "--lapis.databaseConfig.path=$customLapisConfig",
                 "--referenceGenomeFilename=$referenceGenomeFilename",
-                "--lapis.accessKeys.path=./src/test/resources/config/testAccessKeys.yaml"
+                "--lapis.accessKeys.path=$rootDir/src/test/resources/config/testAccessKeys.yaml"
         ])
     }
 }