Upgrade firecracker to v0.22.4

Dockerfile

@@ -12,7 +12,9 @@ RUN apk add --no-cache \
 ARG FIRECRACKER_VERSION
 # If amd64 is set, this is "-x86_64". If arm64, this should be "-aarch64".
 ARG FIRECRACKER_ARCH_SUFFIX
-RUN wget -q -O /usr/local/bin/firecracker https://github.com/firecracker-microvm/firecracker/releases/download/${FIRECRACKER_VERSION}/firecracker-${FIRECRACKER_VERSION}${FIRECRACKER_ARCH_SUFFIX}
+RUN wget -qO- https://github.com/firecracker-microvm/firecracker/releases/download/${FIRECRACKER_VERSION}/firecracker-${FIRECRACKER_VERSION}${FIRECRACKER_ARCH_SUFFIX}.tgz | tar -xvz && \
+    mv release-${FIRECRACKER_VERSION}/firecracker-${FIRECRACKER_VERSION}${FIRECRACKER_ARCH_SUFFIX} /usr/local/bin/firecracker && \
+    rm -r release-${FIRECRACKER_VERSION}
 
 # Add ignite-spawn to the image
 ADD ./ignite-spawn /usr/local/bin/ignite-spawn

docs/installation.md

@@ -121,7 +121,7 @@ commands should now be available:
 ```console
 $ ignite version
 Ignite version: version.Info{Major:"0", Minor:"8", GitVersion:"v0.8.0", GitCommit:"...", GitTreeState:"clean", BuildDate:"...", GoVersion:"...", Compiler:"gc", Platform:"linux/amd64"}
-Firecracker version: v0.22.1
+Firecracker version: v0.22.4
 Runtime: containerd
 ```
 

hack/FIRECRACKER_VERSION

@@ -1 +1 @@
-v0.22.1
+v0.22.4