NO-JIRA: chore(ci): add SC3041 and SC3020 to hadolint ignore list (#2784)

These warnings are suppressed because:

* Bash is available in RHEL base images
* The codebase uses bash-specific features

This avoids modifying multiple Dockerfiles
Hadolint will no longer report these warnings for the RStudio Dockerfiles. The warnings were about POSIX sh compatibility, but since bash is guaranteed in these images, suppressing them is acceptable.

Author: jiridanek

ci/hadolint-config.yaml

@@ -28,6 +28,10 @@ ignored:
   - DL3007
   # SC3060 warning: In POSIX sh, string replacement is undefined.
   - SC3060
+  # SC3041 warning: In POSIX sh, set flag -E is undefined. (bash-specific ERR trap)
+  - SC3041
+  # SC3020 warning: In POSIX sh, &> is undefined. (bash-specific redirect operator)
+  - SC3020
   # SC2086 info: Double quote to prevent globbing and word splitting.
   - SC2086
   # SC2046 warning: Quote this to prevent word splitting.