ci: cache prepared virtual machines

.github/workflows/freebsd-build.yml

@@ -35,7 +35,7 @@ jobs:
       id: test
       uses: vmactions/freebsd-vm@c46abacb49f09938ca4e1702d15d836285d694cc # v1.5.9
       with:
-        usesh: true
+        cache-after-prepare: true
         prepare: |
           pkg install -y bash autotools m4 devel/xxhash zstd liblz4 python3 archivers/liblz4 git
         run: |

.github/workflows/netbsd-build.yml

@@ -35,7 +35,7 @@ jobs:
       id: test
       uses: vmactions/netbsd-vm@c8a0d7ddb84619a7a8cc4e652efa7950b3fd9f92 # v1.5.2
       with:
-        usesh: true
+        cache-after-prepare: true
         prepare: |
           PATH=/usr/sbin:$PATH pkg_add autoconf automake python312
           ln -sf /usr/pkg/bin/python3.12 /usr/pkg/bin/python3

.github/workflows/openbsd-build.yml

@@ -35,7 +35,7 @@ jobs:
       id: test
       uses: vmactions/openbsd-vm@5f7b2c933b8846a138361d6843c52af4bef5d945 # v1.4.8
       with:
-        usesh: true
+        cache-after-prepare: true
         prepare: |
           pkg_add -I bash autoconf%2.71 automake%1.16
         run: |

.github/workflows/solaris-build.yml

@@ -35,7 +35,7 @@ jobs:
       id: test
       uses: vmactions/solaris-vm@87d3c436511cef802cd1637f86f73b1a97715c8c # v1.4.1
       with:
-        usesh: true
+        cache-after-prepare: true
         prepare: |
           pkg install bash automake gnu-m4 pkg://solaris/runtime/python-35 autoconf gcc git
         run: |