Move relauncher shell script

crates/gitbutler-tauri/.gitignore

@@ -3,3 +3,6 @@ gen/
 
 # Extra binaries, figure out why they end up in this directory on build.
 gitbutler-git-*
+
+# Injected for Tauri v1 -> v2 upgrade, remove when no longer needed.
+./GitButler*

crates/gitbutler-tauri/inject-relauncher.sh

@@ -1,4 +1,7 @@
 #!/usr/bin/env bash
+# Injects the relauncher into the right place with the correct platform
+# information. It is only needed for macos, but there is no way to restrict
+# "externalBin" in the turi configuration to a specific platform.
 set -euo pipefail
 
 THIS="$0"
@@ -14,7 +17,7 @@ CRATE_ROOT="$ROOT/crates/gitbutler-tauri"
 
 log injecting relauncher into crates/gitbutler-tauri "(TRIPLE=${TRIPLE})"
 if ! [[ $TRIPLE =~ "windows" ]]; then
-    cp -v "$CRATE_ROOT/files/relauncher" "$CRATE_ROOT/$RELAUNCHER-${TRIPLE}"
+    cp -v "$CRATE_ROOT/relauncher.sh" "$CRATE_ROOT/$RELAUNCHER-${TRIPLE}"
 else
-    cp -v "$CRATE_ROOT/files/relauncher" "$CRATE_ROOT/$RELAUNCHER-${TRIPLE}.exe"
+    cp -v "$CRATE_ROOT/relauncher.sh" "$CRATE_ROOT/$RELAUNCHER-${TRIPLE}.exe"
 fi

crates/gitbutler-tauri/relauncher.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+# This relauncher is necessary for Tauri v1 -> v2 upgrades. The binary name
+# has changed from e.g. `GitButler` to `gitbutler-tauri`, but on restarting
+# the app the executable is expected to have the same path. This bash script
+# is copied into the known location of the old binary name.
+
+SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
+
+# Line needs to be quoted since $SCRIPT_DIR contains spaces.
+"$SCRIPT_DIR/gitbutler-tauri"