Add lint.sh script (#1122)

.github/workflows/lint.yml

@@ -27,7 +27,4 @@ jobs:
     - name: Run linters
       run: |
         git diff-index --quiet HEAD -- pwndbg tests
-        isort --check-only --diff pwndbg tests
-        black --diff --check pwndbg tests
-        flake8 --show-source pwndbg/ tests
-        python3 -m py_compile $(git ls-files 'pwndbg/*.py')
+        ./lint.sh

lint.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+set -o xtrace
+set -o errexit
+
+isort --check-only --diff pwndbg tests
+black --diff --check pwndbg tests
+flake8 --show-source pwndbg tests