fix(astro/core): Do not automatically add trailing slash (#5608)

* fix: Do not automatically add trailing slash

* Update .changeset/twelve-cooks-tickle.md

Co-authored-by: Bjorn Lu <bjornlu.dev@gmail.com>

* fix: change semver

Co-authored-by: Bjorn Lu <bjornlu.dev@gmail.com>

Author: konojunya

.changeset/twelve-cooks-tickle.md

@@ -0,0 +1,5 @@
+---
+'astro': major
+---
+
+A trailing slash will not be automatically appended to `import.meta.env.SITE`. Instead, it will be the value of the `site` config as is. This may affect usages of `${import.meta.env.SITE}image.png`, which will need to be updated accordingly.

packages/astro/src/core/config/schema.ts

@@ -57,11 +57,7 @@ export const AstroConfigSchema = z.object({
 		.optional()
 		.default(ASTRO_CONFIG_DEFAULTS.outDir)
 		.transform((val) => new URL(val)),
-	site: z
-		.string()
-		.url()
-		.optional()
-		.transform((val) => (val ? appendForwardSlash(val) : val)),
+	site: z.string().url().optional(),
 	base: z.string().optional().default(ASTRO_CONFIG_DEFAULTS.base),
 	trailingSlash: z
 		.union([z.literal('always'), z.literal('never'), z.literal('ignore')])