Install nodejs independently of antora

spring-grpc-docs/.gitignore

@@ -0,0 +1 @@
+!package.json

spring-grpc-docs/package.json

@@ -0,0 +1,14 @@
+{
+  "dependencies": {
+    "@antora/atlas-extension": "^1.0.0-alpha.1",
+    "@antora/cli": "^3.2.0-alpha.2",
+    "@antora/collector-extension": "^1.0.0-alpha.3",
+    "@antora/site-generator-default": "^3.2.0-alpha.2",
+    "@asciidoctor/cli": "^4.0.0",
+    "@asciidoctor/tabs": "^1.0.0-beta.3",
+    "@djencks/asciidoctor-mathjax": "^0.0.9",
+    "@springio/antora-extensions": "^1.5.0",
+    "@springio/asciidoctor-extensions": "^1.0.0-alpha.9",
+    "downdoc": "^1.0.2-stable"
+  }
+}

spring-grpc-docs/pom.xml

@@ -14,6 +14,7 @@
 
 	<properties>
 		<maven-exec-plugin.version>3.4.1</maven-exec-plugin.version>
+		<maven-frontend-plugin.version>1.15.1</maven-frontend-plugin.version>
 		<maven-gem-plugin.version>3.0.3</maven-gem-plugin.version>
 		<configprops.path>${project.basedir}/src/main/antora/modules/ROOT/partials/_configprops.adoc</configprops.path>
 		<configprops.inclusionPattern>spring.grpc.*</configprops.inclusionPattern>
@@ -47,6 +48,25 @@
 			</extension>
 		</extensions>
 		<plugins>
+			<plugin>
+				<groupId>com.github.eirslett</groupId>
+				<artifactId>frontend-maven-plugin</artifactId>
+				<version>${maven-frontend-plugin.version}</version>
+				<executions>
+					<execution>
+						<id>install node and npm</id>
+						<goals>
+							<goal>install-node-and-npm</goal>
+							<goal>npm</goal>
+						</goals>
+						<phase>generate-resources</phase>
+					</execution>
+				</executions>
+				<configuration>
+					<!-- Has to be the same as the antora lifecycle-->
+					<nodeVersion>v18.17.1</nodeVersion>
+				</configuration>
+			</plugin>
 			<plugin>
 				<groupId>io.spring.maven.antora</groupId>
 				<artifactId>antora-maven-plugin</artifactId>
@@ -184,7 +204,8 @@
 						</goals>
 						<phase>compile</phase>
 						<configuration>
-							<execArgs>${project.build.directory}/gems/bin/asciidoctor-reducer -o
+							<execArgs>
+								${project.build.directory}/gems/bin/asciidoctor-reducer -o
 								${project.build.directory}/CONTRIBUTING.adoc
 								${basedir}/src/main/antora/modules/ROOT/pages/contribution-guidelines.adoc</execArgs>
 						</configuration>