feat(android): prepare auto builds

.github/workflows/build-android.yml

@@ -7,6 +7,7 @@ on:
   workflow_dispatch:
     inputs: null
 
+# see: https://medium.com/@dcostalloyd90/automating-android-builds-with-github-actions-a-step-by-step-guide-2a02a54f59cd
 jobs:
   build:
     runs-on: ubuntu-latest
@@ -40,8 +41,25 @@ jobs:
       - name: Install npm Packages
         #  if: steps.npm-cache.outputs.cache-hit != 'true'
         run: npm i
+
+
+      - name: Decode Keystore
+        env:
+          ENCODED_STRING: ${{ secrets.DROID_KEYSTORE_BASE_64 }}
+          RELEASE_KEYSTORE_PASSWORD: ${{ secrets.DROID_KEYSTORE_PASSWORD }}
+          RELEASE_KEYSTORE_ALIAS: ${{ secrets.DROID_KEYSTORE_ALIAS }}
+          RELEASE_KEY_PASSWORD: ${{ secrets.DROID_KEY_PASSWORD }}
+
+        run: |
+          echo $ENCODED_STRING > keystore-b64.txt
+          base64 -d keystore-b64.txt > keystore.jks
+
       - name: Build
         run: npm run dist:android:prod
+        env:
+          RELEASE_KEYSTORE_PASSWORD: ${{ secrets.DROID_KEYSTORE_PASSWORD }}
+          RELEASE_KEYSTORE_ALIAS: ${{ secrets.DROID_KEYSTORE_ALIAS }}
+          RELEASE_KEY_PASSWORD: ${{ secrets.DROID_KEY_PASSWORD }}
 
       - name: 'Upload Artifact'
         uses: actions/upload-artifact@v3

android/app/build.gradle

@@ -46,10 +46,21 @@ android {
                 buildConfigField "String", key, value.toString()
             }
 
+            signingConfig signingConfigs.release
             minifyEnabled false
             proguardFiles getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro"
         }
     }
+
+    signingConfigs{
+        release{
+            storeFile file("../keystore.jks")
+            storePassword System.getenv("RELEASE_KEYSTORE_PASSWORD")
+            keyAlias System.getenv("RELEASE_KEYSTORE_ALIAS")
+            keyPassword System.getenv("RELEASE_KEY_PASSWORD")
+        }
+    }
+
     flavorDimensions "version"
     productFlavors {
         play {