Publish embedded package for releases of Element Call (#3086)

* Publish embedded package for releases of Element Call

Part of https://github.com/element-hq/element-call/issues/2994

This PR:

- Publishes embedded builds as Tarball, NPM, AAR, SwiftPM for releases
- Publishes full builds as Tarball for releases
- Adds comments to release notes with the built artifact locations

* Update embedded/web/package.json

Co-authored-by: Michael Telatynski <7t3chguy@gmail.com>

* Update .github/workflows/publish-embedded-packages.yaml

* Update embedded/ios/Package.swift

* Apply suggestions from code review

* Try dry-run of gradlew

* Whitespace

* Fix more instances of unpinned GHA

* Minimise permissions

* Upload release notes once

To reduce concurrency

* Fix npm publish permissions

---------

Co-authored-by: Michael Telatynski <7t3chguy@gmail.com>

embedded/android/lib/build.gradle.kts

@@ -0,0 +1,67 @@
+/*
+ * Copyright 2025 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+import com.vanniktech.maven.publish.SonatypeHost
+
+plugins {
+    alias(libs.plugins.android.library)
+    alias(libs.plugins.maven.publish)
+}
+
+repositories {
+    mavenCentral()
+    google()
+}
+
+android {
+    namespace = "io.element.android"
+
+    defaultConfig {
+        compileSdk = 35
+        minSdk = 24
+    }
+}
+
+mavenPublishing {
+    publishToMavenCentral(SonatypeHost.S01)
+
+    signAllPublications()
+
+    val version = System.getenv("EC_VERSION")
+    coordinates("io.element.android", "element-call-embedded", version)
+    pom {
+        name = "Embedded Element Call for Android"
+        description.set("Android AAR package containing an embedded build of the Element Call widget.")
+        inceptionYear.set("2025")
+        url.set("https://github.com/element-hq/element-call/")
+        licenses {
+            license {
+                name.set("GNU Affero General Public License (AGPL) version 3.0")
+                url.set("https://www.gnu.org/licenses/agpl-3.0.txt")
+                distribution.set("https://www.gnu.org/licenses/agpl-3.0.txt")
+            }
+            license {
+                name.set("Element Commercial License")
+                url.set("https://raw.githubusercontent.com/element-hq/element-call/refs/heads/livekit/LICENSE-COMMERCIAL")
+                distribution.set("https://raw.githubusercontent.com/element-hq/element-call/refs/heads/livekit/LICENSE-COMMERCIAL")
+            }
+        }
+        developers {
+            developer {
+                id.set("matrixdev")
+                name.set("matrixdev")
+                url.set("https://github.com/element-hq/")
+                email.set("android@element.io")
+            }
+        }
+        scm {
+            url.set("https://github.com/element-hq/element-call/")
+            connection.set("scm:git:git://github.com/element-hq/element-call.git")
+            developerConnection.set("scm:git:ssh://git@github.com/element-hq/element-call.git")
+        }
+    }
+}