Introduce flavors; CLI rework; Kernel rework; RaspberryPi et al. support

.dockerignore

@@ -1,5 +1,6 @@
 # Exclude build artifacts from Docker build context
 mkosi.output/
+mkosi.input/
 mkosi.cache/
 mkosi.tools/
 mkosi.tools.manifest

.editorconfig

@@ -0,0 +1,20 @@
+# Match Ruff style in .editorconfig format
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.py]
+indent_style = space
+indent_size = 4
+tab_width = 4
+max_line_length = 100
+
+[{*.sh,*.sh.j2}]
+indent_style = space
+indent_size = 4
+tab_width = 4
+max_line_length = 100