fix(ci): address remaining review feedback

- Remove dead ci.Dockerfile (not referenced by CI workflows)
- Fix release.yml: all ubuntu-latest -> ubuntu-24.04
- Fix release.yml: JDK via apt-get instead of curl download
- Fix release.yml: hardcoded *** token -> use GITEA_TOKEN secret
- Fix release.yml: JAVA_HOME path consistency

.gitea/workflows/release.yml

@@ -16,7 +16,7 @@ jobs:
   # ── Lint (gate) ─────────────────────────────────────────────
   lint:
     name: Lint
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -55,7 +55,7 @@ jobs:
   # ── Test (gate) ──────────────────────────────────────────────────
   test:
     name: Test
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     needs: [lint]
     steps:
       - name: Checkout
@@ -89,7 +89,7 @@ jobs:
   # ── Android release build ───────────────────────────────────
   build-android:
     name: Build Android Release
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     needs: [test]
     steps:
       - name: Checkout
@@ -98,12 +98,10 @@ jobs:
       - name: Setup Java 17
         run: |
           set -e
-          curl -fsSL "https://github.com/adoptium/temurin17-binaries/releases/download/jdk-17.0.12%2B7/OpenJDK17U-jdk_x64_linux_hotspot_17.0.12_7.tar.gz" \
-            -o /tmp/jdk.tar.gz
-          mkdir -p "$HOME/jdk"
-          tar -xzf /tmp/jdk.tar.gz -C "$HOME/jdk" --strip-components=1
-          export PATH="$HOME/jdk/bin:$PATH"
-          export JAVA_HOME="$HOME/jdk"
+          apt-get update
+          apt-get install -y openjdk-17-jdk
+          export JAVA_HOME="/usr/lib/jvm/java-17-openjdk-amd64"
+          export PATH="$JAVA_HOME/bin:$PATH"
           java -version
 
       - name: Setup Flutter
@@ -177,13 +175,13 @@ jobs:
 
       - name: Build APK (release)
         run: |
-          export JAVA_HOME="$HOME/jdk"
+          export JAVA_HOME="/usr/lib/jvm/java-17-openjdk-amd64"
           export PATH="$PWD/flutter/bin:$PATH"
           flutter build apk --release
 
       - name: Build App Bundle (release)
         run: |
-          export JAVA_HOME="$HOME/jdk"
+          export JAVA_HOME="/usr/lib/jvm/java-17-openjdk-amd64"
           export PATH="$PWD/flutter/bin:$PATH"
           flutter build appbundle --release
 
@@ -207,7 +205,7 @@ jobs:
   # on Linux runners. To enable, configure a macOS runner.
   build-ios:
     name: Build iOS Release
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     needs: [test]
     steps:
       - name: Checkout
@@ -224,7 +222,7 @@ jobs:
   # ── Publish Gitea Release ────────────────────────────────────
   publish-release:
     name: Publish Release
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     needs: [build-android]
     steps:
       - name: Checkout