ci: Add workflow for creating vX major tags (#7)

* Add workflow for creating vX major tags

* docs: Automated README update

---------

Co-authored-by: bendwyer-github-actions-app[bot] <161165928+bendwyer-github-actions-app[bot]@users.noreply.github.com>

Author: bendwyer

.github/workflows/promote-major-version.yml

@@ -0,0 +1,16 @@
+---
+name: promote-major-version
+
+on:
+  release:
+    types:
+      - published
+      - edited
+
+jobs:
+  promote:
+    uses: bendwyer/github-workflows/.github/workflows/github-action-promote-major-version.yml@main
+    with:
+      gh_app_id: ${{ vars.GH_APP_ID }}
+    secrets:
+      gh_app_private_key: ${{ secrets.GH_APP_PRIVATE_KEY }}

README.md

@@ -198,7 +198,7 @@ module "us_exit_node" {
 |------|-------------|------|---------|:--------:|
 | <a name="input_lightsail_availability_zone"></a> [lightsail\_availability\_zone](#input\_lightsail\_availability\_zone) | AWS Lightsail availability zone for the AWS Lightsail region. | `string` | `"a"` | no |
 | <a name="input_lightsail_region"></a> [lightsail\_region](#input\_lightsail\_region) | AWS Lightsail region to deploy to. | `string` | `"eu-central-1"` | no |
-| <a name="input_tailscale_exit_node_tag_names"></a> [tailscale\_exit\_node\_tag\_names](#input\_tailscale\_exit\_node\_tag\_names) | Tailscale exit node tag names to associate with ephemeral key. Tag names must be be prefixed with 'tag:' | `set(string)` | <pre>[<br>  "tag:exit"<br>]</pre> | no |
+| <a name="input_tailscale_exit_node_tag_names"></a> [tailscale\_exit\_node\_tag\_names](#input\_tailscale\_exit\_node\_tag\_names) | Tailscale exit node tag names to associate with ephemeral key. Tag names must be be prefixed with 'tag:' | `set(string)` | <pre>[<br/>  "tag:exit"<br/>]</pre> | no |
 
 ## Outputs