chunk the haul (#519)

* chunk the haul
* validate numeric suffix on join
* enforce valid chunk size
* containerd warning
* updated test.go files

.github/workflows/tests.yaml

@@ -250,6 +250,13 @@ jobs:
           hauler store save --filename store.tar.zst
           # verify via save with filename and platform (amd64)
           hauler store save --filename store-amd64.tar.zst --platform linux/amd64
+          # verify via save with chunk-size (splits into haul-chunked_0.tar.zst, haul-chunked_1.tar.zst, ...)
+          hauler store save --filename haul-chunked.tar.zst --chunk-size 50M
+          # verify chunk files exist and original is removed
+          ls haul-chunked_*.tar.zst
+          ! test -f haul-chunked.tar.zst
+          # verify at least two chunks were produced
+          [ $(ls haul-chunked_*.tar.zst | wc -l) -ge 2 ]
 
       - name: Remove Hauler Store Contents
         run: |
@@ -269,6 +276,14 @@ jobs:
           hauler store load --filename store.tar.zst --tempdir /opt
           # verify via load with filename and platform (amd64)
           hauler store load --filename store-amd64.tar.zst
+          # verify via load from chunks using explicit first chunk
+          rm -rf store
+          hauler store load --filename haul-chunked_0.tar.zst
+          hauler store info
+          # verify via load from chunks using base filename (auto-detect)
+          rm -rf store
+          hauler store load --filename haul-chunked.tar.zst
+          hauler store info
 
       - name: Verify Hauler Store Contents
         run: |
@@ -291,7 +306,7 @@ jobs:
 
       - name: Remove Hauler Store Contents
         run: |
-          rm -rf store haul.tar.zst store.tar.zst store-amd64.tar.zst
+          rm -rf store haul.tar.zst store.tar.zst store-amd64.tar.zst haul-chunked_*.tar.zst
           hauler store info
 
       - name: Verify - hauler store sync