Remove v1 code (#681)

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### Proposed changes

Remove any now-obsolete v1 code and fix-up the Makefile. Most of the
top-level build targets work as expected, often by delegating to the
sub-Makefiles.

TODO:

- [ ] CI scripts

Later:

- Deployment-related changes (to take place in a separate PR)
- Top-level tests

#### New Help Output
```
❯ make help

Usage:
  make <target>

General
  help             Display this help.

Development
  codegen          Generate CRDs and documentation
  generate-crdocs  Generate API Reference documentation into 'docs/crds/'.

Build
  build            Build the agent and operator binaries. 
  build-agent      Build the agent binary.
  build-operator   Build the operator manager binary.
  build-image      Build the operator image.
  push-image       Push the operator image.

Deployment
  install-crds     Install CRDs into the K8s cluster specified in ~/.kube/config.
  deploy           Deploy controller manager to the K8s cluster specified in ~/.kube/config.

Release
  prep             Prepare the next release.

Build Dependencies
  crdoc            Download crdoc locally if necessary. No version check.

```
### Related issues (optional)

<!--Refer to related PRs or issues: #1234, or 'Fixes #1234' or 'Closes
#1234'.
Or link to full URLs to issues or pull requests in other GitHub
repositories. -->

.github/workflows/release.yaml

@@ -72,10 +72,11 @@ jobs:
       - name: Login to Docker Hub
         run: |
           echo "${{ secrets.DOCKER_PASSWORD }}" | docker login docker.io -u ${{ secrets.DOCKER_USERNAME }} --password-stdin
-      - name: GoReleaser
-        uses: goreleaser/goreleaser-action@v2
+      - name: Run GoReleaser
+        uses: goreleaser/goreleaser-action@v6
         with:
-          version: v1.26.2
-          args: release --skip-sign
+          distribution: goreleaser
+          version: '~> v2'
+          args: release --clean
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.gitignore

@@ -91,3 +91,4 @@ tags
 ### IntelliJ ###
 .idea
 .envrc
+bin/*

.goreleaser.yml

@@ -2,8 +2,9 @@ version: 2
 project_name: pulumi-kubernetes-operator
 
 builds:
-  - ldflags:
-      - -X github.com/pulumi/pulumi-kubernetes-operator/version.Version={{.Tag}}
+  - id: pulumi-kubernetes-operator
+    ldflags:
+      - -X github.com/pulumi/pulumi-kubernetes-operator/operator/version.Version={{.Tag}}
       - -w -extldflags "-static"
     flags:
       - -a
@@ -16,7 +17,8 @@ builds:
     env:
       - CGO_ENABLED=0
       - GO111MODULE=on
-    main: ./cmd/manager/main.go
+    main: ./cmd/main.go
+    dir: operator
     binary: pulumi-kubernetes-operator
 
   - id: pulumi-kubernetes-agent
@@ -72,7 +74,7 @@ dockers:
     goarch: amd64
 
     # Path to the Dockerfile (from the project root).
-    dockerfile: Dockerfile
+    dockerfile: operator/Dockerfile
 
     # Templates of the Docker image names.
     image_templates:
@@ -85,26 +87,3 @@ dockers:
       - "--label=org.label-schema.name={{ .ProjectName }}"
       - "--label=org.label-schema.vcs-ref={{ .ShortCommit }}"
       - "--label=org.label-schema.vcs-url='{{ .GitURL }}'"
-
-  - id: pulumi-kubernetes-agent
-    # GOOS of the built binary that should be used.
-    goos: linux
-
-    # GOARCH of the built binary that should be used.
-    goarch: amd64
-
-    # Path to the Dockerfile (from the project root).
-    dockerfile: agent/Dockerfile
-
-    # Templates of the Docker image names.
-    image_templates:
-      - "pulumi/pulumi-kubernetes-agent:latest"
-      - "pulumi/pulumi-kubernetes-agent:{{ .Version }}"
-
-    build_flag_templates:
-      - "--pull"
-      - "--label=org.label-schema.build-date={{.Date}}"
-      - "--label=org.label-schema.name={{ .ProjectName }}"
-      - "--label=org.label-schema.vcs-ref={{ .ShortCommit }}"
-      - "--label=org.label-schema.vcs-url='{{ .GitURL }}'"
-