fix(problem_matcher): ignore ANSI color escape codes for matching

When PackSquash outputs log messages with colors, problem matchers do
not seem to work. However, they worked fine in the past, when colors
were not printed. I suspected that GitHub not removing ANSI color escape
codes before matching could be the culpirit, and indeed there are some
ignored GitHub issues in the VS Code repositories about it (GitHub
runners inherit problem matchers from VS Code).

Let's tweak the regexes used for matching to take into account the ANSI
escape sequences that PackSquash may use. To test that they work as
expected, temporarily introduce a failure in a test workflow.

.github/workflows/test_empty_pack_with_latest_build.yml

@@ -26,10 +26,8 @@ jobs:
         uses: actions/checkout@v3
         with:
           fetch-depth: 0
-      - name: Generate minimal PackSquash options file
-        run: echo 'pack_directory = "test/empty_resource_pack"' > packsquash-options.toml
       - name: Run PackSquash
         uses: ./ # Uses an action in the root directory
         with:
           packsquash_version: latest
-          options_file: packsquash-options.toml
+          path: test/empty_resource_pack

src/problem_matcher.ts

@@ -8,7 +8,7 @@ const json = {
             severity: 'error',
             pattern: [
                 {
-                    regexp: '^[!❌] (?!.*Invalid stick parity bit)(.+)$',
+                    regexp: '^(?:\x1B\\[\\d+\\w*)*[!❌] (?!.*Invalid stick parity bit)(.+?)(?:\x1B\\[0m)?$',
                     message: 1
                 }
             ]
@@ -18,10 +18,25 @@ const json = {
             severity: 'warning',
             pattern: [
                 {
-                    regexp: '^[*⚡] (.+)$',
+                    regexp: '^(?:\x1B\\[\\d+\\w*)*[*⚡] (.+?)(?:\x1B\\[0m)?$',
                     message: 1
                 }
             ]
+        },
+        {
+            owner: 'packsquash-file-warning',
+            severity: 'warning',
+            pattern: [
+                {
+                    regexp: '^(?:\x1B\\[\\d+\\w*)*[*⚡] (.+): .+$',
+                    file: 1
+                },
+                {
+                    regexp: '^(?:\x1B\\[\\d+\\w*)*   ?[*⚡] (.+?)(?:\x1B\\[0m)?$',
+                    message: 1,
+                    loop: 1
+                }
+            ]
         }
     ]
 };