Set maven version for jitpack build

https://jitpack.io/com/github/ControlSystemStudio/phoebus/

Author: katysaintin

jitpack.yml

@@ -0,0 +1,20 @@
+name: Phoebus build
+
+on: 
+  push:
+    branches-ignore:
+      - 'master'
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Setup Maven and Java Action
+      uses: s4u/[email protected]
+      with:
+        java-version: '17'
+        maven-version: '3.9.6'
+    - name: Build
+      run: mvn --batch-mode install -DskipTests