ci: add check-spelling (#462)

This is a basic spell checker to make sure words are spelled correctly.

Signed-off-by: Xe Iaso <me@xeiaso.net>
Co-authored-by: Xe Iaso <me@xeiaso.net>

.github/actions/spelling/patterns.txt

@@ -0,0 +1,130 @@
+# See https://github.com/check-spelling/check-spelling/wiki/Configuration-Examples:-patterns
+
+# Automatically suggested patterns
+
+# hit-count: 198 file-count: 52
+# https/http/file urls
+(?:\b(?:https?|ftp|file)://)[-A-Za-z0-9+&@#/*%?=~_|!:,.;]+[-A-Za-z0-9+&@#/*%=~_|]
+
+# hit-count: 22 file-count: 8
+# GitHub actions
+\buses:\s+[-\w.]+/[-\w./]+@[-\w.]+
+
+# hit-count: 19 file-count: 5
+# libraries
+(?:\b|_)[Ll]ib(?:re(?=office)|era(?![lt])|)(?!ero|erty|rar(?:i(?:an|es)|y))(?=[a-z])
+
+# hit-count: 17 file-count: 8
+# version suffix <word>v#
+(?:(?<=[A-Z]{2})V|(?<=[a-z]{2}|[A-Z]{2})v)\d+(?:\b|(?=[a-zA-Z_]))
+
+# hit-count: 15 file-count: 7
+# container images
+image: [-\w./:@]+
+
+# hit-count: 14 file-count: 9
+# imports
+^import\s+(?:(?:static|type)\s+|)(?:[\w.]|\{\s*\w*?(?:,\s*(?:\w*|\*))+\s*\})+
+
+# hit-count: 11 file-count: 2
+# hex digits including css/html color classes:
+(?:[\\0][xX]|\\u|[uU]\+|#x?|%23|&H)[0-9_a-fA-FgGrR]*?[a-fA-FgGrR]{2,}[0-9_a-fA-FgGrR]*(?:[uUlL]{0,3}|[iu]\d+)\b
+
+# hit-count: 8 file-count: 5
+# node packages
+(["'])@[^/'" ]+/[^/'" ]+\g{-1}
+
+# hit-count: 5 file-count: 2
+# css fonts
+\bfont(?:-family|):[^;}]+
+
+# hit-count: 4 file-count: 4
+# set arguments
+\b(?:bash|sh|set)(?:\s+[-+][abefimouxE]{1,2})*\s+[-+][abefimouxE]{3,}(?:\s+[-+][abefimouxE]+)*
+
+# hit-count: 4 file-count: 2
+# css url wrappings
+\burl\([^)]+\)
+
+# hit-count: 2 file-count: 2
+# C network byte conversions
+(?:\d|\bh)to(?!ken)(?=[a-z])|to(?=[adhiklpun]\()
+
+# hit-count: 2 file-count: 1
+# GitHub SHA refs
+\[([0-9a-f]+)\]\(https://(?:www\.|)github.com/[-\w]+/[-\w]+/commit/\g{-1}[0-9a-f]*
+
+# hit-count: 1 file-count: 1
+# copyright
+Copyright (?:\([Cc]\)|)(?:[-\d, ]|and)+(?: [A-Z][a-z]+ [A-Z][a-z]+,?)+
+
+# hit-count: 1 file-count: 1
+# IPv6
+\b(?:[0-9a-fA-F]{0,4}:){3,7}[0-9a-fA-F]{0,4}\b
+
+# hit-count: 1 file-count: 1
+# Docker images
+^\s*(?i)FROM\s+\S+:\S+(?:\s+AS\s+\S+|)
+
+# hit-count: 1 file-count: 1
+# perl run
+perl(?:\s+-[a-zA-Z]\w*)+
+
+# hit-count: 1 file-count: 1
+# go install
+go install(?:\s+[a-z]+\.[-@\w/.]+)+
+
+# hit-count: 1 file-count: 1
+# in check-spelling@v0.0.22+, printf markers aren't automatically consumed
+# printf markers
+(?<!\\)\\[nrt](?=[a-z]{2,})
+
+# hit-count: 1 file-count: 1
+# tar arguments
+\b(?:\\n|)g?tar(?:\.exe|)(?:(?:\s+--[-a-zA-Z]+|\s+-[a-zA-Z]+|\s[ABGJMOPRSUWZacdfh-pr-xz]+\b)(?:=[^ ]*|))+
+
+# Questionably acceptable forms of `in to`
+# Personally, I prefer `log into`, but people object
+# https://www.tprteaching.com/log-into-log-in-to-login/
+\b(?:(?:[Ll]og(?:g(?=[a-z])|)|[Ss]ign)(?:ed|ing)?) in to\b
+
+# to opt in
+\bto opt in\b
+
+# pass(ed|ing) in
+\bpass(?:ed|ing) in\b
+
+# acceptable duplicates
+# ls directory listings
+[-bcdlpsw](?:[-r][-w][-SsTtx]){3}[\.+*]?\s+\d+\s+\S+\s+\S+\s+[.\d]+(?:[KMGT]|)\s+
+# mount
+\bmount\s+-t\s+(\w+)\s+\g{-1}\b
+# C types and repeated CSS values
+\s(auto|buffalo|center|div|inherit|long|LONG|none|normal|solid|thin|transparent|very)(?: \g{-1})+\s
+# C enum and struct
+\b(?:enum|struct)\s+(\w+)\s+\g{-1}\b
+# go templates
+\s(\w+)\s+\g{-1}\s+\`(?:graphql|inject|json|yaml):
+# doxygen / javadoc / .net
+(?:[\\@](?:brief|defgroup|groupname|link|t?param|return|retval)|(?:public|private|\[Parameter(?:\(.+\)|)\])(?:\s+(?:static|override|readonly|required|virtual))*)(?:\s+\{\w+\}|)\s+(\w+)\s+\g{-1}\s
+
+# macOS file path
+(?:Contents\W+|(?!iOS)/)MacOS\b
+
+# Python package registry has incorrect spelling for macOS / Mac OS X
+"Operating System :: MacOS :: MacOS X"
+
+# "company" in Germany
+\bGmbH\b
+
+# IntelliJ
+\bIntelliJ\b
+
+# Commit message -- Signed-off-by and friends
+^\s*(?:(?:Based-on-patch|Co-authored|Helped|Mentored|Reported|Reviewed|Signed-off)-by|Thanks-to): (?:[^<]*<[^>]*>|[^<]*)\s*$
+
+# Autogenerated revert commit message
+^This reverts commit [0-9a-f]{40}\.$
+
+# ignore long runs of a single character:
+\b([A-Za-z])\g{-1}{3,}\b