fix(ci): disable incremental compilation for sccache and fix container ownership

Two fixes for CI issues:

1. sccache incompatibility: Add CARGO_INCREMENTAL=0 because sccache doesn't
   work with Cargo's incremental compilation. The forge-builder Docker
   container has CARGO_INCREMENTAL=1 set, which caused builds to fail.

2. Container ownership: Add cleanup step to fix file ownership at end of
   Linux container builds. Docker containers run as root, creating files
   that the runner user can't clean up, causing subsequent jobs (e2e, test)
   to fail with EACCES permission errors.

Author: namastex888

.github/workflows/build-all-platforms.yml

@@ -40,13 +40,13 @@ jobs:
           - os: [self-hosted, Linux, X64]  # Self-hosted runner on ct200 with Docker
             target: x86_64-unknown-linux-gnu
             platform: linux-x64
-            container: ghcr.io/namastexlabs/forge-builder:nightly-2025-12-04
+            container_image: ghcr.io/namastexlabs/forge-builder:nightly-2025-12-04
             cargo_jobs: 20  # ct200 has 20 cores
           - os: [self-hosted, Linux, X64]  # Self-hosted runner on ct200 with Docker (cross-compile)
             target: aarch64-unknown-linux-gnu
             platform: linux-arm64
             use-zigbuild: true
-            container: ghcr.io/namastexlabs/forge-builder:nightly-2025-12-04
+            container_image: ghcr.io/namastexlabs/forge-builder:nightly-2025-12-04
             cargo_jobs: 20  # ct200 has 20 cores
           # Android builds moved to separate workflow (build-android-apk.yml)
           - os: [self-hosted, Windows, X64]  # Self-hosted runner on ct201
@@ -67,7 +67,7 @@ jobs:
             cargo_jobs: 3  # GitHub-hosted M1 has 3 cores
 
     runs-on: ${{ matrix.os }}
-    container: ${{ matrix.container }}
+    container: ${{ matrix.container_image || '' }}
 
     steps:
       - uses: actions/checkout@v4
@@ -128,6 +128,7 @@ jobs:
         run: |
           echo "SCCACHE_GHA_ENABLED=true" >> $GITHUB_ENV
           echo "RUSTC_WRAPPER=sccache" >> $GITHUB_ENV
+          echo "CARGO_INCREMENTAL=0" >> $GITHUB_ENV  # sccache doesn't work with incremental compilation
 
       - name: Cache Rust dependencies
         if: env.SKIP_BUILD != 'true'
@@ -359,6 +360,13 @@ jobs:
           path: npx-cli/dist/${{ matrix.platform }}/
           overwrite: true
 
+      # Fix file ownership for subsequent jobs on self-hosted runners
+      # Docker containers run as root, creating root-owned files that the runner user can't clean up
+      - name: Fix file ownership (Linux containers)
+        if: always() && matrix.container_image
+        shell: bash
+        run: chown -R 1000:1000 $GITHUB_WORKSPACE || true
+
   # Android builds moved to separate workflow: build-android-apk.yml
   # This allows Android to have its own release timeline