rename the next build back to nightly

Rename the build type, workflow, artifact and app id (com.subtracks.nightly)
from next to nightly, and update the signing docs to match.

.github/workflows/build-nightly.yml

@@ -1,4 +1,4 @@
-name: Build Next
+name: Build Nightly
 
 on:
   push:
@@ -19,10 +19,10 @@ jobs:
           persist-credentials: false
       - uses: ./.github/actions/build
         with:
-          gradle-args: ":app:assembleDebug :app:assembleNext --no-daemon"
+          gradle-args: ":app:assembleDebug :app:assembleNightly --no-daemon"
       - name: Checksums
-        run: sha256sum app/build/outputs/apk/debug/app-debug.apk app/build/outputs/apk/next/app-next.apk
+        run: sha256sum app/build/outputs/apk/debug/app-debug.apk app/build/outputs/apk/nightly/app-nightly.apk
       - uses: actions/upload-artifact@v7
         with:
-          name: subtracks-next
+          name: subtracks-nightly
           path: app/build/outputs/apk

app/build.gradle.kts

@@ -80,7 +80,7 @@ android {
         .add("src/integrationTest/kotlin")
 
     signingConfigs {
-        // Committed on purpose: a public key for debug and next builds, never for distribution.
+        // Committed on purpose: a public key for debug and nightly builds, never for distribution.
         getByName("debug") {
             storeFile = file("debug.keystore")
             storePassword = "android"
@@ -100,7 +100,7 @@ android {
 
     buildTypes {
         debug {
-            applicationIdSuffix = ".next"
+            applicationIdSuffix = ".nightly"
         }
         release {
             isMinifyEnabled = true
@@ -109,9 +109,9 @@ android {
             // Release signing when the keystore is supplied (CI); debug elsewhere so local build/install works.
             signingConfig = signingConfigs.findByName("release") ?: signingConfigs.getByName("debug")
         }
-        create("next") {
+        create("nightly") {
             initWith(getByName("release"))
-            applicationIdSuffix = ".next"
+            applicationIdSuffix = ".nightly"
             signingConfig = signingConfigs.getByName("debug")
         }
     }

signing/README.md

@@ -9,12 +9,13 @@ subtracks ships through four channels:
   send to Play, not the APK users install. The installed app verifies against
   Google's app signing certificate (Play Console → App integrity), and the upload
   key only proves the AAB we uploaded.
-- **`next` builds** (the `subtracks-next` artifact from CI) — signed with the
-  public debug key committed here as [`next-certificate.pem`](next-certificate.pem).
+- **`nightly` builds** (the `subtracks-nightly` artifact from CI) — signed with
+  the public debug key committed here as
+  [`nightly-certificate.pem`](nightly-certificate.pem).
 - **F-Droid** — re-signed by F-Droid with its own key; see F-Droid's published
   signing key.
 
-## `next` builds
+## `nightly` builds
 
 Certificate SHA-256:
 
@@ -22,14 +23,14 @@ Certificate SHA-256:
 DF:31:3F:18:58:E9:AD:F4:7F:44:65:B2:80:8F:DC:E5:B9:F8:8A:48:35:DC:D0:79:95:19:61:C3:05:05:08:37
 ```
 
-To check a `next` APK:
+To check a `nightly` APK:
 
 ```sh
-apksigner verify --print-certs subtracks-next.apk
+apksigner verify --print-certs subtracks-nightly.apk
 ```
 
 The `SHA-256 digest` line must equal the fingerprint above (the certificate is
-committed at [`next-certificate.pem`](next-certificate.pem)).
+committed at [`nightly-certificate.pem`](nightly-certificate.pem)).
 
 ## GitHub releases