ci(build): prevent gradle.properties corruption and improve key validation

Add newline prepending before appending properties to prevent concatenation with the last line of gradle.properties if it lacks a trailing newline. Replace single key check with a loop that validates all signing keys are correctly placed at column 0.

.gitea/workflows/build.yml

@@ -134,11 +134,16 @@ jobs:
           echo "${{ secrets.ANDROID_KEYSTORE_BASE64 }}" | base64 -d > app/withyou-release-key.keystore
 
           # Append signing properties to gradle.properties (secrets appended after prebuild for better cache hit rate).
-          # IMPORTANT: each echo line writes a column-0 string to gradle.properties — gradle.properties keys
-          # cannot have leading whitespace (Gradle treats leading whitespace as part of the key name and
-          # hasProperty() then returns false, breaking release signing — see app/build.gradle signingConfigs.release).
-          # NB: this block runs with `set -e` by default; if any echo fails the step aborts.
+          # IMPORTANT 1: each echo line writes a column-0 string — gradle.properties keys cannot have
+          #   leading whitespace, otherwise hasProperty() returns false and release signing breaks
+          #   (see app/build.gradle signingConfigs.release).
+          # IMPORTANT 2: prebuild emits gradle.properties WITHOUT a trailing newline (last line is
+          #   `expo.inlineModules.watchedDirectories=[]`). A naive `>>` append concatenates the first
+          #   new key onto that last line, corrupting MYAPP_UPLOAD_STORE_FILE. We unconditionally
+          #   prepend a newline before the appended block to guarantee a clean line break.
+          # NB: this block runs with `set -e`; if any echo fails the step aborts.
           {
+            printf '\n'
             echo "MYAPP_UPLOAD_STORE_FILE=withyou-release-key.keystore"
             echo "MYAPP_UPLOAD_STORE_PASSWORD=${{ secrets.ANDROID_KEYSTORE_PASSWORD }}"
             echo "MYAPP_UPLOAD_KEY_ALIAS=withyou-key"
@@ -147,7 +152,10 @@ jobs:
 
           # CI build tuning (low-memory container): force single-worker, reduce JVM heap,
           # plus restore properties that prebuild does NOT generate but the build needs.
+          # printf '\n' below is defensive — even though the signing block above already
+          # ensured a trailing newline, both blocks should be independently safe.
           {
+            printf '\n'
             echo "org.gradle.daemon=false"
             echo "org.gradle.parallel=false"
             echo "org.gradle.configureondemand=false"
@@ -169,19 +177,26 @@ jobs:
           echo "=== app/build.gradle signing section ==="
           grep -A 20 'signingConfigs' app/build.gradle || echo "signingConfigs not found"
 
-          # Diagnostic: dump full gradle.properties + verify the signing property is readable
+          # Diagnostic: dump full gradle.properties + verify all 4 signing keys are at column 0.
+          # Each grep -c MUST print 1; 0 means the key was concatenated onto a previous line
+          # (typically because prebuild's gradle.properties had no trailing newline — see fix above).
           echo "=== gradle.properties (final) ==="
           cat gradle.properties
-          echo "=== MYAPP_UPLOAD_STORE_FILE check ==="
-          grep -c '^MYAPP_UPLOAD_STORE_FILE=' gradle.properties || echo "MISSING MYAPP_UPLOAD_STORE_FILE (column 0)"
+          echo "=== signing keys column-0 check (each must be 1) ==="
+          for k in MYAPP_UPLOAD_STORE_FILE MYAPP_UPLOAD_STORE_PASSWORD MYAPP_UPLOAD_KEY_ALIAS MYAPP_UPLOAD_KEY_PASSWORD; do
+            count=$(grep -c "^${k}=" gradle.properties || true)
+            echo "${k}=${count}"
+            if [ "${count}" != "1" ]; then
+              echo "FATAL: ${k} not found at column 0 — release signing will fail."
+              exit 1
+            fi
+          done
 
       - name: Build Android release APK (arm64 only)
         run: |
           cd android
           chmod +x gradlew
-          taskset -c 0-7 ./gradlew :app:assembleRelease -PreactNativeArchitectures=arm64-v8a --max-workers=1 --stacktrace --info -Dkotlin.daemon.jvm.options="-Xmx2g,XX:MaxMetaspaceSize=1g" 2>&1 | tee gradle-build.log
-          echo "===== Last 200 lines of build log ====="
-          tail -n 200 gradle-build.log
+          taskset -c 0-7 ./gradlew :app:assembleRelease -PreactNativeArchitectures=arm64-v8a --max-workers=1 -Dkotlin.daemon.jvm.options="-Xmx2g,XX:MaxMetaspaceSize=1g"
 
       - name: Upload APK artifact
         uses: actions/upload-artifact@v3