chore: GH workflow permissions

Signed-off-by: Jan Kowalleck <jan.kowalleck@gmail.com>

Author: jkowalleck

.github/workflows/publish-snapshot.yml

@@ -2,11 +2,16 @@ name: Maven Publish Snapshot
 
 on: [workflow_dispatch]
 
+permissions: {}
+
 jobs:
   build:
 
     runs-on: ubuntu-latest
 
+    permissions:
+      contents: write  # for git-push after version modifications
+
     steps:
     - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # tag=v4.2.2
     - name: Set up JDK 8

.github/workflows/release.yml

@@ -9,12 +9,14 @@ on:
         default: false
         type: boolean
 
+permissions: {}
+
 jobs:
   build:
     runs-on: ubuntu-latest
 
     permissions:
-      contents: write
+      contents: write  # for git-push after version modifications
 
     steps:
       - name: Checkout code