Fix: JNA issue in release mode (#335)

* Restore checkout config for nightly workflows.

* Add missing proguard config line for JNA.

.github/workflows/nightly.yml

@@ -16,10 +16,6 @@ jobs:
     if: ${{ github.repository == 'vector-im/element-x-android' }}
     steps:
       - uses: actions/checkout@v3
-        with:
-          # Ensure we are building the branch and not the branch after being merged on develop
-          # https://github.com/actions/checkout/issues/881
-          ref: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.sha || github.ref }}
       - name: Use JDK 17
         uses: actions/setup-java@v3
         with:

.github/workflows/nightly_manual.yml

@@ -13,10 +13,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
-        with:
-          # Ensure we are building the branch and not the branch after being merged on develop
-          # https://github.com/actions/checkout/issues/881
-          ref: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.sha || github.ref }}
       - name: Use JDK 17
         uses: actions/setup-java@v3
         with: