build(vhs): add test runner to justfile

Signed-off-by: Christina Sørensen <christina@cafkafk.com>

Justfile

@@ -36,6 +36,9 @@ all-release: build-release test-release
 @test-release:
     cargo test --workspace --release --verbose
 
+alias itest := integration_tests
+@integration_tests:
+    ./tests/vhs-runner.sh
 
 #------------------------#
 # running extended tests #