Revert "Disable spell checking action temporarily (#112)"

This reverts commit dcf6f89.

Author: msimberg

.github/workflows/spelling.yaml

@@ -0,0 +1,30 @@
+name: Check Spelling
+
+on:
+  pull_request:
+
+jobs:
+  spelling:
+    name: Check Spelling
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Check spelling
+        id: spelling
+        # The given commit contains preliminary, unreleased, support for ignoring
+        # whole blocks (multi-line) from spell checking. See
+        # https://github.com/check-spelling/check-spelling/commit/46c981b7c96b3777aff4fd711fc9a8f126121b04
+        # for more details. 
+        uses: check-spelling/check-spelling@46c981b7c96b3777aff4fd711fc9a8f126121b04
+        with:
+          check_file_names: 1
+          post_comment: 0
+          use_magic_file: 1
+          warnings: bad-regex,binary-file,deprecated-feature,large-file,limited-references,no-newline-at-eof,noisy-file,non-alpha-in-dictionary,token-is-substring,unexpected-line-ending,whitespace-in-dictionary,minified-file,unsupported-configuration,no-files-to-check
+          use_sarif: 1
+          extra_dictionary_limit: 20
+          extra_dictionaries:
+            cspell:software-terms/dict/softwareTerms.txt
+            cspell:bash/dict/bash-words.txt
+            cspell:companies/dict/companies.txt
+            cspell:filetypes/filetypes.txt