Better name for dpkg-query --status argument

This uses the variable name `package` rather than `pattern` for the
variable that expands to an argument to `dpkg-query --status`,
since this argument is always treated as a literal package name.

(I had originally named it `pattern` because I had initially been
thinking of using a different search command.)

Author: EliahKagan

.github/workflows/ci.yml

@@ -43,8 +43,8 @@ jobs:
       - name: Verify that we are in an environment with limited dev tools
         run: |
           set -x
-          for pattern in cmake g++ libssl-dev make pkgconf pkg-config; do
-            if dpkg-query --status -- "$pattern"; then
+          for package in cmake g++ libssl-dev make pkgconf pkg-config; do
+            if dpkg-query --status -- "$package"; then
               exit 1
             fi
           done