Change build image to Debian Buster as reasonable glibc base (2.28)

Update README with note on that matter

.editorconfig

@@ -0,0 +1,16 @@
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 4
+indent_style = space
+insert_final_newline = true
+max_line_length = 120
+tab_width = 4
+trim_trailing_whitespace = true
+
+[*.{md, yaml, yml}]
+indent_size = 2
+tab_width = 2
+
+[*.md]
+max_line_length = 80