Initial implementation of the GSI provider

This provider allows Terraform AWS user to manage GSI on dynamo table as
a separate resource as a workaround for
hashicorp/terraform-provider-aws#671.

Using this new resource requires ignoring `global_secondary_index` and
`attribute` and the aws_dynamodb_table resource as described in the
example terraform file.

This provder also provides an `auto_import` mode which should make the
process of migration more seamless.

.github/workflows/release.yml

@@ -0,0 +1,49 @@
+# This GitHub action can publish assets for release when a tag is created.
+# Currently its setup to run on any tag that matches the pattern "v*" (ie. v0.1.0).
+#
+# This uses an action (hashicorp/ghaction-import-gpg) that assumes you set your
+# private key in the `GPG_PRIVATE_KEY` secret and passphrase in the `PASSPHRASE`
+# secret. If you would rather own your own GPG handling, please fork this action
+# or use an alternative one for key handling.
+#
+# You will need to pass the `--batch` flag to `gpg` in your signing step
+# in `goreleaser` to indicate this is being used in a non-interactive mode.
+#
+name: release
+on:
+  push:
+    tags:
+      - 'v*'
+jobs:
+  goreleaser:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v2.4.0
+      -
+        name: Unshallow
+        run: git fetch --prune --unshallow
+      -
+        name: Set up Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.17
+      -
+        name: Import GPG key
+        id: import_gpg
+        uses: hashicorp/ghaction-import-gpg@v2.1.0
+        env:
+          # These secrets will need to be configured for the repository:
+          GPG_PRIVATE_KEY: ${{ secrets.GPG_PRIVATE_KEY }}
+          PASSPHRASE: ${{ secrets.PASSPHRASE }}
+      -
+        name: Run GoReleaser
+        uses: goreleaser/goreleaser-action@v2.8.1
+        with:
+          version: latest
+          args: release --rm-dist
+        env:
+          GPG_FINGERPRINT: ${{ steps.import_gpg.outputs.fingerprint }}
+          # GitHub sets this automatically
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.gitignore

@@ -62,3 +62,5 @@ override.tf.json
 .terraformrc
 terraform.rc
 terraform
+
+terraform-provider-gsi

.goreleaser.yml

@@ -0,0 +1,60 @@
+# Visit https://goreleaser.com for documentation on how to customize this
+# behavior.
+before:
+  hooks:
+    # this is just an example and not a requirement for provider building/publishing
+    - go mod tidy
+builds:
+- env:
+    # goreleaser does not work with CGO, it could also complicate
+    # usage by users in CI/CD systems like Terraform Cloud where
+    # they are unable to install libraries.
+    - CGO_ENABLED=0
+  mod_timestamp: '{{ .CommitTimestamp }}'
+  flags:
+    - -trimpath
+  ldflags:
+    - '-s -w -X main.version={{.Version}} -X main.commit={{.Commit}}'
+  goos:
+    - freebsd
+    - windows
+    - linux
+    - darwin
+  goarch:
+    - amd64
+    - '386'
+    - arm
+    - arm64
+  ignore:
+    - goos: darwin
+      goarch: '386'
+  binary: '{{ .ProjectName }}_v{{ .Version }}'
+archives:
+- format: zip
+  name_template: '{{ .ProjectName }}_{{ .Version }}_{{ .Os }}_{{ .Arch }}'
+checksum:
+  extra_files:
+    - glob: 'terraform-registry-manifest.json'
+      name_template: '{{ .ProjectName }}_{{ .Version }}_manifest.json'
+  name_template: '{{ .ProjectName }}_{{ .Version }}_SHA256SUMS'
+  algorithm: sha256
+signs:
+  - artifacts: checksum
+    args:
+      # if you are using this in a GitHub action or some other automated pipeline, you
+      # need to pass the batch flag to indicate its not interactive.
+      - "--batch"
+      - "--local-user"
+      - "{{ .Env.GPG_FINGERPRINT }}" # set this environment variable for your signing key
+      - "--output"
+      - "${signature}"
+      - "--detach-sign"
+      - "${artifact}"
+release:
+  extra_files:
+    - glob: 'terraform-registry-manifest.json'
+      name_template: '{{ .ProjectName }}_{{ .Version }}_manifest.json'
+  # If you want to manually examine the release before its live, uncomment this line:
+  # draft: true
+changelog:
+  skip: true