Add initial support for remote dev container (home-assistant#24681)

* Add initial support for remote container

* Use constrain

.devcontainer/Dockerfile

@@ -0,0 +1,17 @@
+FROM python:3.7
+
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends \
+        libudev-dev libavformat-dev libavcodec-dev libavdevice-dev \
+        libavutil-dev libswscale-dev libswresample-dev libavfilter-dev \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /workspace
+
+# Install Python dependencies from requirements.txt if it exists
+COPY requirements_test_all.txt homeassistant/package_constraints.txt /workspace/
+RUN pip3 install -r requirements_test_all.txt -c package_constraints.txt
+
+# Set the default shell to bash instead of sh
+ENV SHELL /bin/bash

.devcontainer/devcontainer.json

@@ -0,0 +1,15 @@
+// See https://aka.ms/vscode-remote/devcontainer.json for format details.
+{
+	"name": "Home Assistant Dev",
+	"context": "..",
+	"dockerFile": "Dockerfile",
+	"postCreateCommand": "pip3 install -e .",
+	"extensions": [
+		"ms-python.python"
+	],
+	"settings": {
+		"python.pythonPath": "/usr/local/bin/python",
+		"python.linting.pylintEnabled": true,
+		"python.linting.enabled": true
+	}
+}

.gitignore

@@ -95,7 +95,6 @@ virtualization/vagrant/config
 
 # Visual Studio Code
 .vscode
-.devcontainer
 
 # Built docs
 docs/build