s3: Import middleware from pages.sr.ht

Closes: https://todo.sr.ht/~sircmpwn/pages.sr.ht/19

go mod tidy

Fixes the following error when running `go test`:

    ../../go/pkg/mod/github.com/prometheus/client_golang@v1.14.0/prometheus/internal/metric.go:19:2: missing go.sum entry for module providing package github.com/prometheus/client_model/go (imported by github.com/prometheus/client_golang/prometheus); to add:
    	go get github.com/prometheus/client_golang/prometheus@v1.14.0

Add prometheus SQL connection stats

Also updates the prometheus client_go library

Update pq (Postgres driver) to latest version

Replace x/crypto package by ProtonMail/go-crypto to support ed25519 OpenPGP keys

Add support for mail setups that don't support TLS or Auth

auth: fix /query/api-meta.json route

This route does not need authentication.

Update go-bare

Update dependencies

Sign outgoing emails

Update dowork

Add legacy webhooks worker implementation

Expand context for work queues

Simplify server module

Add email work queue

Drop leftover references to gql.sr.ht

Add basic auth tests

Import GQL server interfaces from gql.sr.ht

Overhaul crypto module

Part 1 of merging gql.sr.ht with core-go

Add crypto module with depessimised webhook signing from gitsrht-update-hook