Merge pull request #10953 from zvonkok/shellcheckrc

ci: Add shellcheckrc

shellcheckrc

@@ -0,0 +1,17 @@
+# Allow opening any 'source'd file, even if not specified as input
+external-sources=true
+
+# Turn on warnings for unquoted variables with safe values
+enable=quote-safe-variables
+
+# Turn on warnings for unassigned uppercase variables
+enable=check-unassigned-uppercase
+
+# Enforces braces around variable expansions to avoid ambiguity or confusion.
+# e.g. ${filename} rather than $filename
+enable=require-variable-braces 
+
+# Requires double-bracket syntax [[ expr ]] for safer, more consistent tests.
+# NO:  if [ "$var" = "value" ]
+# YES: if [[ $var == "value" ]]
+enable=require-double-brackets