Add pre-built devcontainer

.devcontainer/Dockerfile

@@ -1,28 +0,0 @@
-FROM freqtradeorg/freqtrade:develop_freqairl
-
-USER root
-# Install dependencies
-COPY requirements-dev.txt /freqtrade/
-
-ARG USERNAME=ftuser
-
-RUN apt-get update \
-    && apt-get -y install --no-install-recommends apt-utils dialog \
-    && apt-get -y install --no-install-recommends git sudo ssh vim build-essential \
-    && apt-get clean \
-    && mkdir -p /home/${USERNAME}/.vscode-server /home/${USERNAME}/.vscode-server-insiders /home/${USERNAME}/commandhistory \
-    # Add user to Suders
-    && echo $USERNAME ALL=\(root\) NOPASSWD:ALL > /etc/sudoers.d/$USERNAME \
-    && chmod 0440 /etc/sudoers.d/$USERNAME \
-    # keep command history
-    && echo "export PROMPT_COMMAND='history -a'" >> /home/${USERNAME}/.bashrc \
-    && echo "export HISTFILE=~/commandhistory/.bash_history" >> /home/${USERNAME}/.bashrc \
-    && chown ${USERNAME}:${USERNAME} -R /home/${USERNAME}/.local/ \
-    && chown ${USERNAME}: -R /home/${USERNAME}/
-
-USER ftuser
-
-RUN pip install --user autopep8 -r docs/requirements-docs.txt -r requirements-dev.txt --no-cache-dir
-
-# Empty the ENTRYPOINT to allow all commands
-ENTRYPOINT []

.devcontainer/devcontainer.json

@@ -1,9 +1,6 @@
 {
     "name": "freqtrade Develop",
-    "build": {
-        "dockerfile": "Dockerfile",
-        "context": ".."
-    },
+    "image": "ghcr.io/freqtrade/freqtrade-devcontainer:latest",
     // Use 'forwardPorts' to make a list of ports inside the container available locally.
     "forwardPorts": [
         8080