NSHM Unit tests

When running NSHM unit tests in pipeline, instead of running the hazard calculation in the junit test itself the hazard calculation is done by running a java class and writing out the results to JSON files.

gradle/nshm.gradle

@@ -13,6 +13,8 @@ import org.yaml.snakeyaml.Yaml
 
 ext {
   nshmDir = "nshms";
+  envMemory = System.getenv("CI_RUNNER_MEMORY")
+  xmx = envMemory ? envMemory : "16g"
 
   // Download and unzip NSHM
   downloadNshm = {nshm ->
@@ -92,7 +94,7 @@ task testAlaska2007(type: Test) {
   useJUnitPlatform()
   jvmArgs(
       "-Xms2g",
-      "-Xmx8g",
+      "-Xmx${xmx}",
       )
 
   filter {
@@ -116,7 +118,7 @@ task testAlaska2023(type: Test) {
   useJUnitPlatform()
   jvmArgs(
       "-Xms2g",
-      "-Xmx8g",
+      "-Xmx${xmx}",
       )
 
   filter {
@@ -139,8 +141,8 @@ task testConus2018(type: Test) {
 
   useJUnitPlatform()
   jvmArgs(
-      "-Xms2g",
-      "-Xmx8g",
+      "-Xms${xmx}",
+      "-Xmx${xmx}",
       )
 
   filter {
@@ -164,7 +166,7 @@ task testConus2023(type: Test) {
   useJUnitPlatform()
   jvmArgs(
       "-Xms2g",
-      "-Xmx16g",
+      "-Xmx${xmx}",
       )
 
   filter {
@@ -188,7 +190,7 @@ task testHawaii2021(type: Test) {
   useJUnitPlatform()
   jvmArgs(
       "-Xms2g",
-      "-Xmx8g",
+      "-Xmx${xmx}",
       )
 
   filter {