ci: Add missing contents: read permission for checkout (#1128)

Author: mtrezza

.github/workflows/release-manual-docs.yml

@@ -18,6 +18,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 15
     permissions:
+      contents: read
       pages: write
       id-token: write
     environment:

.github/workflows/release-publish.yml

@@ -77,6 +77,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 15
     permissions:
+      contents: read
       pages: write
       id-token: write
     environment:
@@ -109,6 +110,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 15
     permissions:
+      contents: read
       pages: write
       id-token: write
     environment: