fix: use env context instead of secrets in workflow if-condition (#2)

The secrets context is not available in step-level if: conditions,
causing GitHub Actions to reject the workflow file. Reference the
secret via an env var instead, and simplify RELEASE_STORE_FILE to
a static value since Gradle already validates signing credentials.

Author: nuttingd

.github/workflows/release.yml

@@ -27,15 +27,15 @@ jobs:
       - uses: gradle/actions/setup-gradle@v4
 
       - name: Decode release keystore
-        if: ${{ secrets.RELEASE_KEYSTORE_BASE64 != '' }}
+        if: env.RELEASE_KEYSTORE_BASE64 != ''
         run: echo "$RELEASE_KEYSTORE_BASE64" | base64 -d > focaccia.jks
         env:
           RELEASE_KEYSTORE_BASE64: ${{ secrets.RELEASE_KEYSTORE_BASE64 }}
 
       - run: npx --yes -p semantic-release@24 -p @semantic-release/exec@6 semantic-release
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          RELEASE_STORE_FILE: ${{ secrets.RELEASE_KEYSTORE_BASE64 != '' && 'focaccia.jks' || '' }}
+          RELEASE_STORE_FILE: focaccia.jks
           RELEASE_KEYSTORE_PASSWORD: ${{ secrets.RELEASE_KEYSTORE_PASSWORD }}
           RELEASE_KEY_ALIAS: ${{ secrets.RELEASE_KEY_ALIAS }}
           RELEASE_KEY_PASSWORD: ${{ secrets.RELEASE_KEY_PASSWORD }}