Add support for building the site via nix.

.webhook_bridge/pipeline-build-homepage.yaml

@@ -2,6 +2,8 @@ apiVersion: tekton.dev/v1
 kind: PipelineRun
 metadata:
   name: build-homepage
+  labels:
+    pdb: protect
 spec:
   timeouts:
     pipeline: "2h0m0s"
@@ -135,7 +137,7 @@ spec:
             - name: url
               value: https://code.fizz.buzz/talexander/personal_tekton_catalog.git
             - name: revision
-              value: af22c87d0db59dece97d03e6b6a796d84010158f
+              value: dda7b690195b43e8b9859d1caf5dcbf48588ade1
             - name: pathInRepo
               value: task/buildkit-rootless-daemonless/0.1/buildkit-rootless-daemonless.yaml
         params:
@@ -156,6 +158,8 @@ spec:
               - "type=registry,ref=$(params.image-name):buildcache,mode=max,compression=zstd,compression-level=22,rewrite-timestamp=true,image-manifest=true,oci-mediatypes=true"
               - --opt
               - build-arg:SOURCE_DATE_EPOCH=$(tasks.get-git-commit-time.results.unix-time)
+              - --opt
+              - "build-arg:NIX_SUBSTITUTERS=http://ncps.nix-pull-through-cache.svc.cluster.local:80 https://cache.nixos.org"
           - name: BUILDKITD_TOML
             value: |
               debug = true