Name the env boolean spelling tables like device-builder does

parse_enable_env's inline tuples become TRUTHY_ENV_STRINGS and
FALSY_ENV_STRINGS frozensets mirroring cv.boolean's spellings (enable
and disable included) plus the 1/0 env convention, matching
device-builder's TRUTHY_BOOL_STRINGS pattern.

esphome/build_helpers/ccache.py

@@ -11,6 +11,10 @@ from esphome.framework_helpers import strip_win_long_path_prefix, tool_version_r
 
 _LOGGER = logging.getLogger(__name__)
 
+# esphome cv.boolean's spelling tables plus the 1/0 env convention
+TRUTHY_ENV_STRINGS = frozenset({"1", "true", "yes", "on", "enable"})
+FALSY_ENV_STRINGS = frozenset({"0", "false", "no", "off", "disable"})
+
 
 def _ccache_runs(ccache: str) -> bool:
     """Return True when the ``ccache`` found on PATH actually runs."""
@@ -31,9 +35,9 @@ def parse_enable_env(name: str) -> bool | None:
     if raw is None:
         return None
     lowered = raw.strip().lower()
-    if lowered in ("1", "true", "yes", "on"):
+    if lowered in TRUTHY_ENV_STRINGS:
         return True
-    if lowered in ("0", "false", "no", "off"):
+    if lowered in FALSY_ENV_STRINGS:
         return False
     _LOGGER.warning("Ignoring unrecognized %s=%r; use 1 or 0", name, raw)
     return None

tests/unit_tests/build_helpers/test_ccache.py

@@ -97,3 +97,23 @@ def test_resolve_unrecognized_value_warns_and_probes(
         assert ccache.resolve_ccache_path() is None
     mock_probe.assert_called_once()
     assert "unrecognized ESPHOME_CCACHE_ENABLE" in caplog.text
+
+
+@pytest.mark.parametrize(
+    ("raw", "expected"),
+    [
+        ("1", True),
+        ("enable", True),
+        ("ON", True),
+        ("0", False),
+        ("disable", False),
+        ("Off", False),
+        ("maybe", None),
+    ],
+)
+def test_parse_enable_env_spelling_tables(
+    monkeypatch: pytest.MonkeyPatch, raw: str, expected: bool | None
+) -> None:
+    """cv.boolean's spelling tables plus the 1/0 env convention."""
+    monkeypatch.setenv("ESPHOME_CCACHE_ENABLE", raw)
+    assert ccache.parse_enable_env("ESPHOME_CCACHE_ENABLE") is expected