fix: use tar.bz2 package format and update docker image reference

- Change package format from .tar.gz to .tar.bz2 (bzip2 compression)
- Update verify-package target to use tar tjf (bz2) instead of tar tzf (gz)
- Align with Nanvix packaging convention for release artifacts

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: ppenna

.nanvix/.yamllint.yml

@@ -0,0 +1,8 @@
+extends: default
+
+rules:
+  line-length:
+    max: 120
+  truthy:
+    check-keys: false
+  document-start: disable

.nanvix/Makefile.nanvix

@@ -158,14 +158,14 @@ package: all
 	@echo '  --version) echo "2.12.9" ;;' >> dist/$(ARTIFACT_NAME)/sysroot/bin/xml2-config
 	@echo 'esac' >> dist/$(ARTIFACT_NAME)/sysroot/bin/xml2-config
 	chmod +x dist/$(ARTIFACT_NAME)/sysroot/bin/xml2-config
-	tar -czf dist/$(ARTIFACT_NAME).tar.gz -C dist/$(ARTIFACT_NAME) sysroot
-	@echo "  Package: dist/$(ARTIFACT_NAME).tar.gz"
+	tar -cjf dist/$(ARTIFACT_NAME).tar.bz2 -C dist/$(ARTIFACT_NAME) sysroot
+	@echo "  Package: dist/$(ARTIFACT_NAME).tar.bz2"
 
 verify-package:
 	@echo "=== Verifying libxml2 package ==="
 	$(eval ARTIFACT_NAME := libxml2-$(PLATFORM)-$(PROCESS_MODE)-$(MEMORY_SIZE))
-	@test -f "dist/$(ARTIFACT_NAME).tar.gz" || { echo "FAIL: tarball not found"; exit 1; }
-	@tar tzf "dist/$(ARTIFACT_NAME).tar.gz" | grep -q 'sysroot/lib/libxml2.a' || { echo "FAIL: missing libxml2.a"; exit 1; }
+	@test -f "dist/$(ARTIFACT_NAME).tar.bz2" || { echo "FAIL: tarball not found"; exit 1; }
+	@tar tjf "dist/$(ARTIFACT_NAME).tar.bz2" | grep -q 'sysroot/lib/libxml2.a' || { echo "FAIL: missing libxml2.a"; exit 1; }
 	@echo "  PASS: libxml2 package verification"
 
 # ===========================================================================

.nanvix/black.toml

@@ -0,0 +1,3 @@
+[tool.black]
+line-length = 88
+target-version = ["py312"]

.nanvix/pyrightconfig.json

@@ -0,0 +1,9 @@
+{
+  "pythonVersion": "3.12",
+  "typeCheckingMode": "strict",
+  "include": [
+    "."
+  ],
+  "venvPath": ".",
+  "venv": "venv"
+}