Add install-password-manager step

.install-password-manager.sh

@@ -0,0 +1,31 @@
+#!/bin/sh
+
+type rbw >/dev/null 2>&1 && exit
+
+install_cargo_binstall() {
+    # Test if cargo binstall is installed
+    cargo binstall
+    if [ $? -eq 0 ]; then
+        return
+    fi
+    curl -L --proto '=https' --tlsv1.2 -sSf https://raw.githubusercontent.com/cargo-bins/cargo-binstall/main/install-from-binstall-release.sh | bash
+
+    # Test again
+    cargo binstall
+    if [ $? -ne 0 ]; then
+        echo "Failed to install cargo binstall"
+        exit 1
+    fi
+}
+
+install_rbw() {
+    # Test if rbw is installed
+    command -v rbw >/dev/null 2>&1 && return
+    cargo binstall rbw
+
+    # Test again
+    command -v rbw >/dev/null 2>&1
+}
+
+install_cargo_binstall
+install_rbw