ci: ec: enforce proper line endings for more files

The POSIX standard defines a line as terminating in a newline. Non-POSIX
systems (such as Windows) generally do not automatically add a newline
to the end of a line, leading to some files not having a newline at their
end. This is an issue because, while a good portion of modern Linux tooling
can handle missing newlines, some cannot, leading to breakage on
non-conformant files. This is also better for consistency and preventing
unnecessary edits to files because a contributor's editor saves a file with
an automatically added newline when there wasn't one originally.

Signed-off-by: Aster Boese <asterboese@mailbox.org>
Part-of: <https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/8197>

.editorconfig

@@ -7,18 +7,23 @@
 # Top-most EditorConfig file.
 root = true
 
+[*]
+end_of_line = lf
+insert_final_newline = true
+
+# Ignore .git and blobs
+[{.git/**,**.{cer,kwl,rle,salt}}]
+end_of_line = unset
+insert_final_newline = unset
+
 [{**.{ini,sh,rules,nft},**/APKBUILD,CODEOWNERS}]
 indent_style = tab
-end_of_line = lf
 trim_trailing_whitespace = true
-insert_final_newline = true
 
 [**.md]
 # No indent_size since space size has meaning in markdown
 indent_style = space
-end_of_line = lf
 trim_trailing_whitespace = true
-insert_final_newline = true
 
 # Forked from Alpine
 [extra-repos/systemd/networkmanager/networkmanager.rules]