Minor fixes. Update github actions.

.github/workflows/snapshot.yml

@@ -1,10 +1,11 @@
 name: Snapshot
 
 "on":
+  workflow_dispatch: {}
   push:
     branches:
-      - 'main'
-      - '[1-9]+.[0-9]+.x'
+      - main
+      - '*.x'
 
 jobs:
 
@@ -32,9 +33,11 @@ jobs:
       - lint-yaml
     steps:
       - uses: actions/checkout@v2
-      - uses: actions/setup-java@v1
+      - uses: actions/setup-java@v2
         with:
+          distribution: temurin
           java-version: 11
+          cache: maven
           server-id: sonatype-nexus
           server-username: SERVER_USERNAME
           server-password: SERVER_PASSWORD