add retic.exe download to install script

.gitignore

@@ -1,4 +1,5 @@
 local.exclude
 logs
 restic.exe
-secrets.ps1
+secrets.ps1
+state.xml

config.ps1

@@ -1,6 +1,7 @@
 # backup configuration
+$ExeName = "restic.exe"
 $InstallPath = "C:\restic"
-$ResticExe = Join-Path $InstallPath "restic.exe"
+$ResticExe = Join-Path $InstallPath $ExeName
 $StateFile = Join-Path $InstallPath "state.xml"
 $WindowsExcludeFile = Join-Path $InstallPath "windows.exclude"
 $LocalExcludeFile = Join-Path $InstallPath "local.exclude"

install.ps1

@@ -1,5 +1,15 @@
 . .\config.ps1
 
+# download restic
+if(-not (Test-Path $ResticExe)) {
+    $url = "https://github.com/restic/restic/releases/download/v0.9.6/restic_0.9.6_windows_amd64.zip"
+    $output = Join-Path $InstallPath "restic.zip"
+    Invoke-WebRequest -Uri $url -OutFile $output
+    Expand-Archive -LiteralPath $output $InstallPath
+    Remove-Item $output
+    Get-ChildItem *.exe | Rename-Item -NewName $ExeName
+}
+
 
 # Create log directory if it doesn't exit
 if(-not (Test-Path $LogPath)) {