chore: improve linting, testing, and GitHub Actions setup (#3583)

- Update golangci-lint version from `v1.48.0` to `v1.52.2`
- Remove Gitter notifications from GitHub Actions workflow
- Add gosec linter settings and include specific rules
- Exclude revive linter for test files
- Remove Gitter badge from README.md
- Delete codecov.yml file
- Change function parameter name in fs.go
- Remove unused parameter in defaultHandleRecovery function

Signed-off-by: appleboy <appleboy.tw@gmail.com>

.golangci.yml

@@ -19,6 +19,22 @@ linters:
     - nolintlint
     - revive
     - wastedassign
+
+linters-settings:
+  gosec:
+    # To select a subset of rules to run.
+    # Available rules: https://github.com/securego/gosec#available-rules
+    # Default: [] - means include all rules
+    includes:
+      - G102
+      - G106
+      - G108
+      - G109
+      - G111
+      - G112
+      - G201
+      - G203
+
 issues:
   exclude-rules:
     - linters:
@@ -37,3 +53,6 @@ issues:
     - path: _test\.go
       linters:
         - gosec # security is not make sense in tests
+    - linters:
+        - revive
+      path: _test\.go