fix: Deprecated 'set-output' issue (#1)

### Description of your changes
Trying to get rid of the deprecated `set-output` issue.

fixes terraform-docs#109

I have:

- [x] Read and followed terraform-docs' [contribution process].

### How has this code been tested
I ended up changing some of the workflow files to do something different outside of your account but still using the same code inside of your account.  This allowed me to better test/run your validation steps externally.

[contribution process]: https://git.io/Jt3K5

.github/workflows/ci.yml

@@ -1,6 +1,7 @@
 name: ci
 
 on:
+  workflow_dispatch:
   pull_request:
 
 jobs:

.github/workflows/publish.yml

@@ -1,9 +1,15 @@
 name: publish
 
 on:
+  workflow_dispatch:
   push:
     branches:
       - main
+    paths:
+      - .github/workflows/publish.yml
+      - Dockerfile
+      - action.yml
+      - src/docker-entrypoint.sh
 
 env:
   REGISTRY_USERNAME: ${{ secrets.REGISTRY_USERNAME }}

.github/workflows/test.yml

@@ -1,6 +1,7 @@
 name: validate
 
 on:
+  workflow_dispatch:
   push:
     branches:
       - main
@@ -33,8 +34,22 @@ jobs:
           sudo chmod 755 /usr/local/bin/gomplate
 
       - name: Check README content based on action.yml
+        if: ${{ github.repository_owner == 'terraform-docs' }}
         run: |
           ./scripts/update-readme.sh
           if [ $(git status --porcelain | grep -c 'M README.md') -eq 1 ]; then
+            git diff
             exit 1
           fi
+
+      - name: Check README content based on action.yml
+        if: ${{ github.repository_owner != 'terraform-docs' }}
+        run: |
+          ./scripts/update-readme.sh
+          if [ $(git status --porcelain | grep -c 'M README.md') -eq 1 ]; then
+            git config user.email "noreply.${{ github.actor }}@github.com"
+            git config user.name "${{ github.actor }}"
+            git add README.md
+            git commit -s -m "docs: README.md Updated"
+            git push
+          fi

README.md

@@ -75,10 +75,10 @@ jobs:
 | indention | Indention level of Markdown sections [1, 2, 3, 4, 5] | `2` | false |
 | output-file | File in module directory where the docs should be placed | `README.md` | false |
 | output-format | terraform-docs format to generate content (see [all formats](https://github.com/terraform-docs/terraform-docs/blob/master/docs/FORMATS\_GUIDE.md)) (ignored if `config-file` is set) | `markdown table` | false |
-| output-method | Method should be one of `replace`, `inject`, or `print` | `inject` | false |
+| output-method | Method should be one of `replace`, `inject`, or `print`. Set as an empty string if `output.mode` and `output.file` are defined in config-file | `inject` | false |
 | recursive | If true it will update submodules recursively | `false` | false |
 | recursive-path | Submodules path to recursively update | `modules` | false |
-| template | When provided will be used as the template if/when the `output-file` does not exist | `<!-- BEGIN_TF_DOCS -->\n{{ .Content }}\n<!-- END_TF_DOCS -->` | false |
+| template | When provided will be used as the template if/when the `output-file` does not exist. Set as an empty string if `output.template` is defined in config-file | `<!-- BEGIN_TF_DOCS -->\n{{ .Content }}\n<!-- END_TF_DOCS -->` | false |
 | working-dir | Comma separated list of directories to generate docs for (ignored if `atlantis-file` or `find-dir` is set) | `.` | false |
 
 #### Output Method (output-method)

src/docker-entrypoint.sh

@@ -177,7 +177,7 @@ fi
 set +e
 num_changed=$(git_status)
 set -e
-echo "num_changed=${num_changed}" >> $GITHUB_OUTPUT
+echo "num_changed=${num_changed}" >> "$GITHUB_OUTPUT"
 
 if [ "${INPUT_GIT_PUSH}" = "true" ]; then
     git_commit