github action android build steps

.github/scripts/decrypt-secret.ps1

@@ -0,0 +1,29 @@
+param (
+  [Parameter(Mandatory=$true)]
+  [string] $filename,
+  [string] $output
+)
+
+$homePath = $env:HOME
+$rootPath = $env:GITHUB_WORKSPACE
+
+$secretInputPath = $rootPath + "/.github/secrets"
+$input = $secretInputPath + $filename
+
+$passphrase = $env:DECRYPT_FILE_PASSWORD
+
+if ([string]::IsNullOrEmpty($output)) {
+  $secretOutputPath = $homePath + "/secrets/"
+  if($filename.EndsWith(".gpg")) {
+    $output = $secretOutputPath + $filename.TrimEnd(".gpg")
+  } else {
+    $output = $secretOutputPath + $filename + ".plaintext"
+  }
+}
+
+if(!(Test-Path -Path $secretPath))  
+{
+  New-Item -ItemType Directory -Path $secretPath 
+}
+
+gpg --quiet --batch --yes --decrypt --passphrase="$passphrase" --output $output $input