merge develop into staging

See merge request !177

Change the on-grid continuous deployment tool to deploy the "develop" branch to the staging grid

See merge request !176

Avoid copying nixpkgs to the store a second time in nix-shell.

See merge request !168

Allow building the local grid with a clean checkout.

Closes #86

See merge request !171

Move NixOS systems tests to `nixos/tests`.

See merge request !173

Don't include vagrant in shell.nix if running in a container.

See merge request !167

Don't wait for cerbot before starting PaymentServer.

See merge request !170

Remove some out of date references.

See merge request !169

Since !146, PaymentServer is proxied behind nginx, so there is no need to wait
for certificates or network interfaces before starting the server.

Expose all local packages as new module argument.

Closes #81

See merge request !163

Move configuration of domain and targetHost to generic locations.

See merge request !161

Manage access to payment metrics

Closes privatestorageops#368

See merge request !146

Set `NIX_PATH` in `shellHook` of `shell.nix`.

See merge request !162

If `nix-shell` is run interactively on NixOS, in way that has loaded
`/etc/profile` (for example `docker exec <container> nix-shell`), then
`/etc/profile` will be sourced in the shell that nix-shell starts. That
overwrites the `NIX_PATH` set by `shell.nix`.

If we instead set `NIX_PATH` in the the `shellHook`, that always takes
precedence.

Make the per-grid inline module more explicit.

See merge request !160

Adopt the Nix packaging from our nixpkgs fork and use it

Closes #79

See merge request !158

Merge remote-tracking branch 'whetstone/368.manage-access-to-payment-metrics' into 368.manage-access-to-payment-metrics