Publish from Gitea: releases, CI and install docs

Gitea implements no Terraform provider registry, so distribution goes
through release archives plus a filesystem mirror. GoReleaser targets
the Gitea release API; the archive names follow HashiCorp's convention
because that is the only shape a filesystem mirror recognises.

No GPG signing: signatures are a registry-protocol requirement and a
filesystem mirror never checks them.

Cross-repo links point at Gitea; Go module paths deliberately do not.

.goreleaser.yml

@@ -0,0 +1,89 @@
+# Publishes provider binaries to a Gitea release.
+#
+# Gitea has no Terraform provider registry -- that protocol is not one of the
+# ~20 package types it implements -- so these archives are consumed through a
+# filesystem mirror instead. See "Installing" in the README.
+#
+# The archive names follow HashiCorp's convention
+# (terraform-provider-NAME_VERSION_OS_ARCH.zip) because a filesystem mirror
+# recognises exactly that shape, and nothing else.
+version: 2
+
+project_name: terraform-provider-dokploy
+
+before:
+  hooks:
+    - go mod download
+
+builds:
+  - id: provider
+    main: .
+    binary: "{{ .ProjectName }}_v{{ .Version }}"
+    env:
+      - CGO_ENABLED=0
+    flags:
+      - -trimpath
+    ldflags:
+      - -s -w
+      - -X main.version={{ .Version }}
+    goos:
+      - darwin
+      - linux
+      - windows
+      - freebsd
+    goarch:
+      - amd64
+      - arm64
+      - "386"
+    ignore:
+      - goos: darwin
+        goarch: "386"
+
+archives:
+  - id: provider
+    formats: [zip]
+    name_template: "{{ .ProjectName }}_{{ .Version }}_{{ .Os }}_{{ .Arch }}"
+    files:
+      - none*
+
+checksum:
+  name_template: "{{ .ProjectName }}_{{ .Version }}_SHA256SUMS"
+  algorithm: sha256
+
+# No `signs:` block on purpose. GPG signatures are required by the Terraform
+# *registry* protocol; a filesystem mirror never checks them. Adding signing
+# here would imply a verification step that nothing performs.
+
+changelog:
+  use: git
+  sort: asc
+  filters:
+    exclude:
+      - "^docs:"
+      - "^test:"
+      - "^chore:"
+
+gitea_urls:
+  api: https://gitea.coolify.vojtkov.dev/api/v1
+  download: https://gitea.coolify.vojtkov.dev
+
+release:
+  gitea:
+    owner: usr_unknown
+    name: terraform-provider-dokploy
+  header: |
+    ## terraform-provider-dokploy {{ .Tag }}
+
+    Gitea cannot serve the Terraform registry protocol, so install through a
+    filesystem mirror:
+
+    ```bash
+    VERSION={{ trimprefix .Tag "v" }}
+    OS_ARCH="$(go env GOOS)_$(go env GOARCH)"
+    DEST=~/.local/share/terraform/plugins/registry.terraform.io/maxvojtkov/dokploy/$VERSION/$OS_ARCH
+    mkdir -p "$DEST"
+    unzip -j terraform-provider-dokploy_${VERSION}_${OS_ARCH}.zip -d "$DEST"
+    ```
+
+    Then point Terraform at the mirror -- the exact `~/.terraformrc` block is
+    printed by `make install`.