chore: add a nix derivation

default.nix

+{ system ? builtins.currentSystem }:
+let
+    pkgs = import <nixpkgs> { inherit system; };
+    mach-nix = import (builtins.fetchGit {
+        url = "https://github.com/uwmisl/mach-nix";
+        ref = "master";
+    }) {
+      inherit pkgs;
+      pypiDataRev = "5c6e5ecbc5a60fb9c43dc77be8e0eb8ac89f4fee";
+      pypiDataSha256 = "0gnq6r92bmnhqjykx3jff7lvg7wbpayd0wvb0drra8r8dvmr5b2d";
+    };
+    renku = import (pkgs.fetchgit {
+        url = "https://github.com/swissdatasciencecenter/renku-python";
+        rev = "refs/heads/nix";
+        deepClone = true;
+        sha256 = "0hlrnyym2ifivdczmy17r5ipyrs25ay0zr576wc4n283azccbkj5";
+    }) { } ;
+    python-packages = mach-nix.mkPython {
+        requirements = builtins.readFile ./requirements.txt;
+        packagesExtra = [ ./src/covid-19/covid_19_utils ];
+    };
+in with pkgs;
+    mkShell {
+        buildInputs = [ python-packages renku nodejs ];
+    }

requirements.txt

-aiohttp==3.6.2
-alembic==1.4.0
-altair==4.0.1
-ansiwrap==0.8.4
-appnope==0.1.0
-argcomplete==1.11.1
-async-generator==1.10
-async-timeout==3.0.1
-attrs==19.3.0
-backcall==0.1.0
-bleach==3.1.1
-blinker==1.4
-certifi==2019.11.28
-certipy==0.1.3
-cffi==1.13.2
-chardet==3.0.4
-Click==7.0
-colorama==0.4.3
-cryptography==2.8
-cycler==0.10.0
-decorator==4.4.1
-defusedxml==0.6.0
-distro==1.4.0
-entrypoints==0.3
-future==0.18.2
-gitdb==4.0.2
-GitPython==3.1.0
-idna==2.9
-importlib-metadata==1.5.0
-ipykernel==5.1.4
-ipython==7.12.0
-ipython-genutils==0.2.0
-ipywidgets
-jedi==0.16.0
-Jinja2==2.11.1
-json5==0.9.0
-jsonschema==3.2.0
-jupyter-client==6.0.0
-jupyter-core==4.6.3
-jupyter-rsession-proxy==1.1
-jupyterlab_server>=1.1.0
-jupyter-server-proxy==1.2.0
-jupyter-telemetry==0.0.5
-jupyterlab-git==0.20.0rc0
-kiwisolver==1.1.0
-Mako==1.1.0
-MarkupSafe==1.1.1
-matplotlib==3.2.1
-mistune==0.8.4
-multidict==4.7.5
-nbconvert==5.6.1
-nbdime~=2.0
-nbformat==5.0.4
-notebook==6.0.3
-numpy==1.18.1
-oauthlib==3.0.1
-pamela==1.0.0
-pandas==1.0.1
-pandocfilters==1.4.2
-papermill==1.1.0
-parso==0.6.1
-pexpect==4.8.0
-pickleshare==0.7.5
-pipx==0.15.1.3
-powerline-shell==0.7.0
-prometheus-client==0.7.1
-prompt-toolkit==3.0.3
-ptyprocess==0.6.0
-pycosat==0.6.3
-pycparser==2.19
-pycurl==7.43.0.5
-Pygments==2.5.2
-PyJWT==1.7.1
-pyOpenSSL==19.1.0
-pyparsing==2.4.6
-pyrsistent==0.15.7
-PySocks==1.7.1
-python-dateutil==2.8.1
-python-editor==1.0.4
-python-json-logger==0.1.11
-python-oauth2==1.1.1
-pytz==2019.3
-PyYAML==5.3
-pyzmq==19.0.0
-requests==2.23.0
-ruamel.yaml==0.15.80
-ruamel.yaml.clib==0.2.0
-Send2Trash==1.5.0
-simpervisor==0.3
-six==1.14.0
-smmap==3.0.1
-SPARQLWrapper==1.8.5
-SQLAlchemy==1.3.13
-tenacity==6.1.0
-terminado==0.8.3
-testpath==0.4.4
-textwrap3==0.9.2
-toolz==0.10.0
-tornado==6.0.3
-tqdm==4.43.0
-traitlets==4.3.3
-urllib3==1.25.7
-userpath==1.3.0
-vega-datasets==0.8.0
-voila
-wcwidth==0.1.8
-webencodings==0.5.1
-yarl==1.4.2
-xlrd
-zipp==3.0.0
+numpy
+pandas