build: Allow building release artifacts in-tree

This change avoids all need for changing any file under
VCS to insert signing keys and configs for release builds.

Example contents of keystore.properties

```
// Location of keystore, relative to module build.gradle,
// in this case, of the app module
storeFile=../wireguard.jks
storePassword=b3ty0uc4nth4xxth1s
keyAlias=wireguard
keyPassword=4ndr01dsux
```

Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>

1 files changed, 2 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
index 74325146..3dde301c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -13,3 +13,5 @@ build/
 *.class
 *.dex
 *.iml
+*.jks
+keystore.properties