Add check-spelling action

.github/actions/spell-check/advice.txt

@@ -0,0 +1,16 @@
+<details>
+<summary>
+:pencil2: Contributor please read this
+</summary>
+
+* If the items listed above are names, please add them to `.github/actions/spell-check/dictionary/names.txt`.
+* You can probably just add items into `.github/actions/spell-check/whitelist/jitsi.txt`.
+* If you need to use a specific token in one place and it shouldn't generally be used, you can
+add an item in `.github/actions/spell-check/patterns.txt`.
+
+See the `README.md` in each directory for more information.
+</details>
+
+#### :warning: Reviewers
+At present, the action that triggered this message will not show its :x: in this PR unless the branch is within this repository.
+Thus, you **should** make sure that this comment has been addressed before merging this PR.

.github/actions/spell-check/excludes.txt

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+(?:^|/)dirs$
+(?:^|/)go\.mod$
+(?:^|/)go\.sum$
+(?:^|/)package-lock\.json$
+(?:^|/)sources(?:|\.dep)$
+SUMS$
+\.ai$
+\.bmp$
+\.cer$
+\.class$
+\.crl$
+\.crt$
+\.csr$
+\.dll$
+\.DS_Store$
+\.eot$
+\.eps$
+\.exe$
+\.gif$
+\.graffle$
+\.gz$
+\.icns$
+\.ico$
+\.jar$
+\.jpeg$
+\.jpg$
+\.key$
+\.lib$
+\.lock$
+\.map$
+\.min\..
+\.mp3$
+\.mp4$
+\.otf$
+\.pbxproj$
+\.pdf$
+\.pem$
+\.png$
+\.pom$
+\.psd$
+\.runsettings$
+\.sig$
+\.so$
+\.svg$
+\.svgz$
+\.tar$
+\.tgz$
+\.ttf$
+\.woff
+\.xcf$
+\.xls
+\.xpm$
+\.yml$
+\.zip$
+^\.editorconfig$
+^\.github/actions/spell-check/
+^\.gitignore$

.github/actions/spell-check/patterns/README.md

@@ -0,0 +1,12 @@
+The contents of each `.txt` file in this directory are merged together.
+Each line is a Perl 5 regular expression.
+Nothing is guaranteed about the order in which they're merged.
+-- If this is a problem, please reach out.
+
+Note: order of the contents of these files can matter.
+Lines from an individual file are handled in file order.
+Files are selected in alphabetical order.
+
+* [patterns](patterns.txt) is the main list -- there is nothing
+particularly special about the file name (beyond the extension which is
+important).

.github/actions/spell-check/patterns/domain.txt

@@ -0,0 +1,6 @@
+# These are violations of TLD namespace
+# They should use example.com and friends
+# This file is here to shame the project into fixing things
+
+fdfsgv1\@auth\.domain23\.com/pc3
+focus@auth\.domain4?\.com/fdsfwetg

.github/actions/spell-check/patterns/patterns.txt

@@ -0,0 +1,26 @@
+https://(?:(?:www\.|)youtube\.com|youtu.be)/[-a-zA-Z0-9?&=]*
+https://groups\.google\.com/d/topic/[^/]+/[a-zA-Z0-9]+/discussion
+-D(?:java|net|exec|maven|assembly|config|include|log|new|skip)
+\\bjitsi
+jitsi-videobridge
+meet[-.]jit[-.]si
+
+\?pwd=[0-9a-z]+
+(?:pwd|ufrag)="[0-9a-z]+"
+"(?:pwd|ufrag|id)": "[a-zA-Z0-9+]+"
+ id="[a-f0-9-]+"
+
+4aca6ed6
+7d2b7ecf
+
+period\}ically
+
+https://github.com/[^/]+/[^/]+/blob/[0-9a-f]+/
+
+(?:[A-F0-9]{2}:){29}[A-F0-9]{2}
+(?:0[Xx]|U\+|#)[a-f0-9A-FGgRr]{2,}[Uu]?[Ll]?\b
+\{[0-9A-FA-F]{8}-(?:[0-9A-FA-F]{4}-){3}[0-9A-FA-F]{12}\}
+
+\b([A-Za-z])\1{3,}\b
+
+<((?:[a-z]+\.|)version)>[0-9.-]+?-[0-9a-z]+</\1>

.github/actions/spell-check/whitelist/README.md

@@ -0,0 +1,9 @@
+The contents of each `.txt` file in this directory are merged together.
+
+* [jitsi](jitsi.txt) general jitsi specific whitelist items
+* [debian](debian.txt) for debian specific magic
+* [names](names.txt) for names or people/companies/projects
+* [systemd](systemd.txt) for systemd specific stuff
+* [whitelist](whitelist.txt) is the main whitelist -- there is nothing
+particularly special about the file name (beyond the extension which is
+important).

.github/actions/spell-check/whitelist/debian.txt

@@ -0,0 +1,47 @@
+buildinfo
+buildpackage
+changelog
+charset
+chmod
+chown
+dch
+DEBEMAIL
+DEBFULLNAME
+debhelper
+deconfigure
+deluser
+devscripts
+dh
+dpkg
+elif
+getent
+gettext
+grep
+groupadd
+groupdel
+installdeb
+installinit
+installsystemd
+logz
+manpage
+msgid
+msgstr
+nf
+nh
+noscripts
+nroff
+OLDCONFIG
+passwd
+postinst
+postrm
+pwgen
+roff
+statoverride
+systemctl
+urandom
+useradd
+usermod
+uuidgen
+xmllint
+xmpp
+xpath