Update E2E kernel handling and Rust toolchain version

- Modify E2E workflow to copy and adjust kernel file permissions dynamically before exporting.
- Bump Rust msrv to 1.78 in CI workflow and update `Cargo.toml` to reflect the new version.

Author: dpsoft

.github/workflows/ci.yml

@@ -116,10 +116,10 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - name: Install Rust 1.70
+      - name: Install Rust 1.78
         uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: "1.70"
+          toolchain: "1.78"
 
       - name: Check build with MSRV
         run: cargo build --workspace --all-features

.github/workflows/e2e.yml

@@ -79,7 +79,12 @@ jobs:
           VOID_BOX_INITRAMFS: /tmp/void-box-test-rootfs.cpio.gz
         run: |
           # Detect kernel version at runtime (env context can't run commands)
-          export VOID_BOX_KERNEL="/boot/vmlinuz-$(uname -r)"
+          KERNEL_SRC="/boot/vmlinuz-$(uname -r)"
+          KERNEL_COPY="/tmp/void-box-kernel-$(uname -r)"
+          sudo cp "$KERNEL_SRC" "$KERNEL_COPY"
+          sudo chown "$USER:$USER" "$KERNEL_COPY"
+          chmod 644 "$KERNEL_COPY"
+          export VOID_BOX_KERNEL="$KERNEL_COPY"
           echo "Kernel: $VOID_BOX_KERNEL"
           echo "Initramfs: $VOID_BOX_INITRAMFS"
 

Cargo.toml

@@ -2,6 +2,7 @@
 name = "void-box"
 version = "0.1.0"
 edition = "2021"
+rust-version = "1.78"
 authors = ["Diego Parra <diegolparra@gmail.com>"]
 description = "Composable workflow sandbox with KVM micro-VMs and native observability"
 repository = "https://github.com/the-void-ia/void-box"