Add Gitpod support

.gitpod.Dockerfile

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+FROM gitpod/workspace-full-vnc:latest
+USER gitpod
+RUN if ! grep -q "export PIP_USER=no" "$HOME/.bashrc"; then printf '%s\n' "export PIP_USER=no" >> "$HOME/.bashrc"; fi
+
+# install ubuntu dependencies
+ENV DEBIAN_FRONTEND=noninteractive 
+RUN sudo apt-get update && \
+    sudo apt-get -y install xvfb ffmpeg git build-essential python-opengl
+
+# install python dependencies
+RUN mkdir cleanrl_utils && touch cleanrl_utils/__init__.py
+RUN pip install poetry
+RUN poetry config virtualenvs.in-project true
+
+# install mujoco
+RUN sudo apt-get -y install wget unzip software-properties-common \
+    libgl1-mesa-dev \
+    libgl1-mesa-glx \
+    libglew-dev \
+    libosmesa6-dev patchelf

.gitpod.yml

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+image:
+  file: .gitpod.Dockerfile
+
+tasks:
+  - init: poetry install
+
+# vscode:
+#   extensions:
+#     - learnpack.learnpack-vscode
+
+github:
+  prebuilds:
+    # enable for the master/default branch (defaults to true)
+    master: true
+    # enable for all branches in this repo (defaults to false)
+    branches: true
+    # enable for pull requests coming from this repo (defaults to true)
+    pullRequests: true
+    # enable for pull requests coming from forks (defaults to false)
+    pullRequestsFromForks: true
+    # add a "Review in Gitpod" button as a comment to pull requests (defaults to true)
+    addComment: true
+    # add a "Review in Gitpod" button to pull requests (defaults to false)
+    addBadge: false
+    # add a label once the prebuild is ready to pull requests (defaults to false)
+    addLabel: prebuilt-in-gitpod