Fix devcontainer and testing Dockerfile (#962)

* Fix permissions for `scripts/setup`

* Add new script

* Use script

* Update Dockerfile

* Rename and clone

* Perms

* Fix

* fi

scripts/install_ha

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+set -ex
+cd "$(dirname "$0")/.."
+
+pip install -r core/requirements.txt --use-pep517
+
+if grep -q 'codecov' core/requirements_test.txt; then
+    # Older HA versions still have `codecov` in `requirements_test.txt`
+    # however it is removed from PyPI, so we cannot install it
+    sed -i '/codecov/d' core/requirements_test.txt
+fi
+pip install -r core/requirements_test.txt --use-pep517
+
+pip install -e core/ --use-pep517
+pip install ulid-transform # this is in Adaptive-lighting's manifest.json
+pip install $(python test_dependencies.py) --use-pep517