CI: Fix disk space issues when building 6.18 kernel

Move disk cleanup step to run immediately after checkout instead of
after config generation, and add more aggressive cleanup of unused
system directories. The 6.18 kernel build was failing with "No space
left on device" during module installation due to significantly larger
build artifacts compared to 6.12.

Signed-off-by: Ameer Hamza <ahamza@ixsystems.com>

Author: ixhamza

.github/workflows/ci.yml

@@ -30,6 +30,24 @@ jobs:
       - name: Check out repository code
         uses: actions/checkout@v4
 
+      - name: Free up disk space
+        run: |
+          echo "Disk space before cleanup:"
+          df -h
+          # Workaround to provide additional free space for kernel build
+          # https://github.com/actions/virtual-environments/issues/2840
+          sudo rm -rf /usr/share/dotnet
+          sudo rm -rf /opt/ghc
+          sudo rm -rf /usr/local/share/boost
+          sudo rm -rf "$AGENT_TOOLSDIRECTORY"
+          sudo rm -rf /usr/local/lib/android
+          sudo rm -rf /usr/share/swift
+          sudo rm -rf /usr/local/.ghcup
+          sudo apt-get clean
+          docker rmi $(docker image ls -aq) 2>/dev/null || true
+          echo "Disk space after cleanup:"
+          df -h
+
       - name: Install dependencies
         run: |
           sudo apt update
@@ -48,12 +66,6 @@ jobs:
           make syncconfig
           make archprepare
           ./scripts/package/mkdebian
-          # Workaround to provide additional free space for kernel build
-          # https://github.com/actions/virtual-environments/issues/2840
-          sudo rm -rf /usr/share/dotnet
-          sudo rm -rf /opt/ghc
-          sudo rm -rf "/usr/local/share/boost"
-          sudo rm -rf "$AGENT_TOOLSDIRECTORY"
 
       - name: Build Kernel
         run: |
@@ -93,6 +105,24 @@ jobs:
       - name: Check out repository code
         uses: actions/checkout@v4
 
+      - name: Free up disk space
+        run: |
+          echo "Disk space before cleanup:"
+          df -h
+          # Workaround to provide additional free space for kernel build
+          # https://github.com/actions/virtual-environments/issues/2840
+          sudo rm -rf /usr/share/dotnet
+          sudo rm -rf /opt/ghc
+          sudo rm -rf /usr/local/share/boost
+          sudo rm -rf "$AGENT_TOOLSDIRECTORY"
+          sudo rm -rf /usr/local/lib/android
+          sudo rm -rf /usr/share/swift
+          sudo rm -rf /usr/local/.ghcup
+          sudo apt-get clean
+          docker rmi $(docker image ls -aq) 2>/dev/null || true
+          echo "Disk space after cleanup:"
+          df -h
+
       - name: Install dependencies
         run: |
           sudo apt update
@@ -116,12 +146,6 @@ jobs:
           make syncconfig
           make archprepare
           ./scripts/package/mkdebian
-          # Workaround to provide additional free space for kernel build
-          # https://github.com/actions/virtual-environments/issues/2840
-          sudo rm -rf /usr/share/dotnet
-          sudo rm -rf /opt/ghc
-          sudo rm -rf "/usr/local/share/boost"
-          sudo rm -rf "$AGENT_TOOLSDIRECTORY"
 
       - name: Build Kernel
         run: |