Set up spell-checking action

.github/actions/spelling/excludes.txt

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+(?:^|/)go\.(?:mod|sum)$
+^\.github/actions/spell-check/

.github/actions/spelling/expect.txt

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+aacaaaa
+aacaaaaa
+ABCDEFGHIJKLMNOPQRSTUVWXY
+Abkh
+acmedb
+acmedns
+adduser
+afrom
+allowfrom
+alphalen
+amd
+api
+apk
+args
+asciicast
+asciinema
+Astring
+Atoi
+atxt
+autocert
+backend
+bbd
+bcrypt
+bdata
+blog
+buildcache
+certbot
+certcfg
+certmagic
+certs
+cfg
+CGO
+Changelog
+Chmod
+chown
+ci
+cidr
+cidrslice
+cmp
+cn
+cname
+config
+connectionstring
+containous
+cors
+corsorigins
+covermode
+coverprofile
+createdb
+cron
+Crontab
+cslice
+CSV
+ctx
+dbcfg
+dbsettings
+dbuser
+dcc
+Debugf
+deeplinks
+dns
+dnscfg
+dnsopts
+DNSSEC
+dnsserver
+dockerfile
+doesnotexist
+domainiwantcertfor
+drecs
+DYgcu
+eabcdb
+eba
+edns
+EDNSA
+EDNSBADVERS
+ek
+ENTRYPOINT
+erikstmartin
+errmsg
+errored
+Errorf
+errstr
+exitval
+Fatalf
+fef
+Fqdn
+fullchain
+fulldomain
+func
+gavv
+gcc
+gecos
+generalcfg
+github
+githubusercontent
+goacmedns
+goarch
+golang
+golangci
+golint
+google
+googleapis
+gopath
+goreleaser
+goreportcard
+goroutines
+gotmp
+goveralls
+gz
+Hoikkala
+hostname
+http
+httpapi
+httpapicfg
+httpexpect
+httprouter
+httptest
+idk
+Ikcwo
+INET
+insversion
+IOE
+ioutil
+ip
+iplist
+IPv
+Jcja
+jetstack
+JGv
+joohoi
+joona
+json
+julienschmidt
+JYNEOCe
+koesie
+komuw
+kuori
+lego
+legolog
+len
+letsencrypt
+letsencryptstaging
+linux
+lmao
+localhost
+logconfig
+logfile
+logformat
+loghook
+loglevel
+logrus
+logrustest
+logtype
+logwriter
+magicconf
+mattn
+mholt
+middleware
+miekg
+mkdir
+MQ
+musl
+Mutex
+nanswer
+Neilpang
+nevergonnagiveyouup
+newreq
+noauth
+noexec
+nonauth
+NONINFRINGEMENT
+notarealegine
+Notfound
+nsadmin
+nsname
+NTj
+NXDOMAIN
+opensource
+Params
+Passthrough
+passwd
+pb
+pem
+pgsql
+placeholders
+png
+postgre
+postgresql
+Println
+privkey
+psql
+Ptr
+pw
+pyacmedns
+pypi
+Qclass
+qtype
+rcode
+README
+recordtype
+Refactored
+regexp
+remoteaddr
+resolv
+resultrows
+ri
+rmbolger
+rowid
+rr
+Rrtype
+rtxt
+shogo
+shoulderror
+sirupsen
+SNI
+soa
+soarr
+Sourcecode
+Sprintf
+sql
+sqlite
+sqlmock
+src
+srv
+stdlog
+stdout
+Stmt
+strconv
+subdomain
+sudo
+svg
+syscall
+systemctl
+systemd
+tcp
+tdb
+testcfg
+testdb
+Tful
+timenow
+tld
+tls
+tmp
+TMPDIR
+tmpfile
+tmpfs
+TODO
+toml
+tooshortfortxt
+tooshortpass
+traefik
+Ttl
+txts
+txtval
+ubuntu
+udp
+uint
+umask
+umount
+uname
+unicode
+Unmarshal
+unmarshall
+unparseable
+upd
+URL
+username
+usr
+utf
+uuid
+UUIDv
+vagrantfile
+Vals
+virtualbox
+Vjl
+vm
+vnet
+webprofusion
+whitelist
+wildcards
+WORKDIR
+www
+Xa
+XAmp
+xbut
+xenolf
+xzf
+YAML
+yml
+yourdomain
+Zabcdefghijklmnopqrstuvwxyz

.github/actions/spelling/patterns.txt

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+# uuid:
+\b[0-9a-fA-F]{8}-(?:[0-9a-fA-F]{4}-){3}[0-9a-fA-F]{12}\b
+"\$2a\$10\$[A-Za-z0-9]*(?:\.2tu?|)"
+https://github\.com/containous/traefik
+# ignore long runs of a single character:
+\b([A-Za-z])\1{3,}\b

.github/workflows/spelling.yml

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+name: Spell checking
+on:
+  push:
+  pull_request_target:
+
+jobs:
+  build:
+    name: Spell checking
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2.0.0
+      with:
+        ref: ${{ github.event.pull_request.head.sha }}
+        fetch-depth: 5
+    - uses: check-spelling/check-spelling@0.0.17-alpha