Deploy separate agents per stage

Jenkinsfile

@@ -1,12 +1,13 @@
 pipeline {
-  agent {
+  agent none
-    docker {
-      image 'velocitypowered/openjdk8-plus-git:slim'
-      args '-v gradle-cache:/root/.gradle:rw -v maven-repo:/maven-repo:rw -v javadoc:/javadoc'
-    }
-  }
   stages {
     stage('Build') {
+      agent {
+        docker {
+          image 'velocitypowered/openjdk8-plus-git:slim'
+          args '-v gradle-cache:/root/.gradle:rw'
+        }
+      }
       steps {
         sh './gradlew build'
         archiveArtifacts 'proxy/build/libs/*-all.jar,api/build/libs/*-all.jar'
@@ -19,6 +20,12 @@ pipeline {
           return GIT_BRANCH == 'master'
         }
       }
+      agent {
+        docker {
+          image 'velocitypowered/openjdk8-plus-git:slim'
+          args '-v maven-repo:/maven-repo:rw'
+        }
+      }
       steps {
         sh 'export MAVEN_DEPLOYMENT=true; ./gradlew publish'
       }
@@ -30,6 +37,12 @@ pipeline {
           return GIT_BRANCH == 'master'
         }
       }
+      agent {
+        docker {
+          image 'velocitypowered/openjdk8-plus-git:slim'
+          args '-v javadoc:/javadoc:rw'
+        }
+      }
       steps {
         sh 'rsync -av --delete ./api/build/docs/javadoc/ /javadoc'
       }