fix(ci): use template-expanded paths in run scripts to bypass Docker ENV

Replace shell variable $ANDROID_HOME references in run blocks with
${{ env.ANDROID_SDK }} template expressions. Gitea runner v1 may not
override Docker-image-baked ENV vars via docker exec; template expansion
happens at workflow compilation time, so the literal path is hardcoded
into the script before the shell runs it.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitea/workflows/android-build.yml

@@ -12,8 +12,7 @@ on:
       - '**.md'
 
 env:
-  ANDROID_HOME: /opt/android-sdk
+  ANDROID_SDK: /opt/android-sdk
-  ANDROID_NDK_HOME: /opt/android-sdk/ndk/25.2.9519653
   NDK_VERSION: "25.2.9519653"
   BUILD_TOOLS_VERSION: "34.0.0"
 
@@ -40,25 +39,25 @@ jobs:
         uses: actions/cache@v4
         id: sdk-cache
         with:
-          path: ${{ env.ANDROID_HOME }}
+          path: ${{ env.ANDROID_SDK }}
           key: v2-android-sdk-ndk${{ env.NDK_VERSION }}-bt${{ env.BUILD_TOOLS_VERSION }}
 
       - name: Install Android SDK + NDK
         if: steps.sdk-cache.outputs.cache-hit != 'true'
         run: |
-          sudo mkdir -p "$ANDROID_HOME/cmdline-tools"
+          sudo mkdir -p ${{ env.ANDROID_SDK }}/cmdline-tools
           curl -sL \
             "https://dl.google.com/android/repository/commandlinetools-linux-11076708_latest.zip" \
             -o /tmp/cmdtools.zip
           unzip -q /tmp/cmdtools.zip -d /tmp/cmdtools
-          sudo mv /tmp/cmdtools/cmdline-tools "$ANDROID_HOME/cmdline-tools/latest"
+          sudo mv /tmp/cmdtools/cmdline-tools ${{ env.ANDROID_SDK }}/cmdline-tools/latest
-          yes | sudo "$ANDROID_HOME/cmdline-tools/latest/bin/sdkmanager" \
+          yes | sudo ${{ env.ANDROID_SDK }}/cmdline-tools/latest/bin/sdkmanager \
-            --sdk_root="$ANDROID_HOME" --licenses > /dev/null 2>&1 || true
+            --sdk_root=${{ env.ANDROID_SDK }} --licenses > /dev/null 2>&1 || true
-          sudo "$ANDROID_HOME/cmdline-tools/latest/bin/sdkmanager" \
+          sudo ${{ env.ANDROID_SDK }}/cmdline-tools/latest/bin/sdkmanager \
-            --sdk_root="$ANDROID_HOME" \
+            --sdk_root=${{ env.ANDROID_SDK }} \
-            "build-tools;$BUILD_TOOLS_VERSION" \
+            "build-tools;${{ env.BUILD_TOOLS_VERSION }}" \
             "platforms;android-34" \
-            "ndk;$NDK_VERSION"
+            "ndk;${{ env.NDK_VERSION }}"
 
       # ── Rust toolchain ─────────────────────────────────────────────────
       - name: Install Rust stable
@@ -105,7 +104,10 @@ jobs:
         run: cargo install cargo-apk --locked
 
       - name: Build debug APK
-        run: cargo apk build --package solitaire_app --lib
+        run: |
+          export ANDROID_HOME=${{ env.ANDROID_SDK }}
+          export ANDROID_NDK_HOME=${{ env.ANDROID_SDK }}/ndk/${{ env.NDK_VERSION }}
+          cargo apk build --package solitaire_app --lib
 
       # ── Artifact ───────────────────────────────────────────────────────
       - name: Upload APK