Static versionCode 1 & versionName 0.0.0 instead of updated for each release

[emanuelb]

in AndroidManifest.xml file of generated APK that is locally built the versionCode is 1 cause in ./android/app/build.gradle it set static value of 1:

airgap-vault/android/app/build.gradle

Lines 13 to 14 in 3811f52

	versionCode 1
	versionName "0.0.0"

while downloading APK from github or playstore will have version value like 48684, and it will be changed for each version.

static versionCode is problematic cause:

1. won't enable manual apk update of locally built apks (will need to remove apk and then install it again) as all built APKs will have the same version.
2. fdroid will detect it as error and for workaround will use other assigned number for it that they manage unless it will be specified in the recipe which wont be automatic (but can be if values are updated in the repo and are accurate for each git tag)

thus it make sense to update this value in repo to the correct one used in upcoming version before releasing new app, so for each git checkout of git tag, the values will be accurate for that version.

same apply for versionName to change it from 0.0.0 to the currently release like 3.2.0