Stop using deprecated initramfs-args

For now we need to write files via postprocess.

oscore/initramfs.yaml

@@ -0,0 +1,14 @@
+# Configuration for the initramfs
+postprocess:
+  - |
+    #!/usr/bin/env bash
+    mkdir -p /usr/lib/dracut/dracut.conf.d
+    cat > /usr/lib/dracut/dracut.conf.d/01-bootc-nohostonly.conf
+    # We want a generic image; hostonly makes no sense as part of a server side build
+    hostonly=no
+    EOF
+    cat > /usr/lib/dracut/dracut.conf.d/49-tpm2-tss.conf << 'EOF'
+    # We want this for systemd-cryptsetup tpm2 locking
+    dracutmodules+=" tpm2-tss "
+    EOF
+  

oscore/manifest.yaml

@@ -27,6 +27,7 @@ check-groups:
 
 include:
   - bootc.yaml
+  - initramfs.yaml
   - bootable-rpm-ostree.yaml
   - networking-tools.yaml
   - system-configuration.yaml

oscore/system-configuration.yaml

@@ -1,10 +1,5 @@
 # These are packages that are related to configuring parts of the system.
 
-initramfs-args:
-  - "--no-hostonly"
-  - "--add"
-  - "tpm2-tss"  # We want this for systemd-cryptsetup tpm2 locking
-
 packages:
   # Configuring SSH keys, cloud provider check-in, etc
   # TODO: needs Ignition kargs