DX-1846: Disable debug

Disable debug to avoid HTMLProofer loading awesome_print, because it
leads to the following failure:

```
Traceback (most recent call last):
	10: from /var/jekyll/entrypoint/lib/entrypoint.rb:3:in `<main>'
	 9: from /var/jekyll/entrypoint/lib/entrypoint.rb:3:in `require_relative'
	 8: from /var/jekyll/entrypoint/lib/commander.rb:7:in `<top (required)>'
	 7: from /var/jekyll/entrypoint/lib/commander.rb:7:in `require_relative'
	 6: from /var/jekyll/entrypoint/lib/commands/verifier.rb:4:in `<top (required)>'
	 5: from /var/jekyll/entrypoint/lib/commands/verifier.rb:4:in `require'
	 4: from /usr/gem/ruby/2.7.0/gems/html-proofer-4.4.0/lib/html-proofer.rb:3:in `<top (required)>'
	 3: from /usr/gem/ruby/2.7.0/gems/html-proofer-4.4.0/lib/html-proofer.rb:3:in `require_relative'
	 2: from /usr/gem/ruby/2.7.0/gems/html-proofer-4.4.0/lib/html_proofer.rb:18:in `<top (required)>'
	 1: from /usr/gem/ruby/2.7.0/gems/zeitwerk-2.6.0/lib/zeitwerk/kernel.rb:35:in `require'
```

https://github.com/SwedbankPay/jekyll-plantuml-docker/actions/runs/3079379097/jobs/4975588911#step:5:2106

Author: asbjornu

.github/workflows/test.yml

@@ -97,8 +97,7 @@ jobs:
             --image-tag ${{ needs.variables.outputs.ghpr_docker_image_tag }} \
             --repository ${{ github.repository }} \
             --dir ${{ github.workspace }}/tests/full \
-            --token ${{ secrets.GITHUB_TOKEN }} \
-            --verbose
+            --token ${{ secrets.GITHUB_TOKEN }}
 
   test-serve-no-gemfile:
     runs-on: ubuntu-latest
@@ -114,8 +113,7 @@ jobs:
             --image-tag ${{ needs.variables.outputs.ghpr_docker_image_tag }} \
             --repository ${{ github.repository }} \
             --dir ${{ github.workspace }}/tests/minimal \
-            --token ${{ secrets.GITHUB_TOKEN }} \
-            --verbose
+            --token ${{ secrets.GITHUB_TOKEN }}
 
   test-build:
     runs-on: ubuntu-latest
@@ -130,8 +128,7 @@ jobs:
             --image-tag ${{ needs.variables.outputs.ghpr_docker_image_tag }} \
             --repository ${{ github.repository }} \
             --dir ${{ github.workspace }}/tests/full \
-            --token ${{ secrets.GITHUB_TOKEN }} \
-            --verbose
+            --token ${{ secrets.GITHUB_TOKEN }}
 
   test-build-no-gemfile:
     runs-on: ubuntu-latest
@@ -146,8 +143,7 @@ jobs:
             --image-tag ${{ needs.variables.outputs.ghpr_docker_image_tag }} \
             --repository ${{ github.repository }} \
             --dir ${{ github.workspace }}/tests/minimal \
-            --token ${{ secrets.GITHUB_TOKEN }} \
-            --verbose
+            --token ${{ secrets.GITHUB_TOKEN }}
 
   test-build-gemspec:
     runs-on: ubuntu-latest
@@ -163,8 +159,7 @@ jobs:
             --image-tag ${{ needs.variables.outputs.ghpr_docker_image_tag }} \
             --repository ${{ github.repository }} \
             --dir ${{ github.workspace }}/tests/gemspec \
-            --token ${{ secrets.GITHUB_TOKEN }} \
-            --verbose
+            --token ${{ secrets.GITHUB_TOKEN }}
 
   rspec:
     runs-on: ubuntu-latest
@@ -206,14 +201,14 @@ jobs:
           docker pull "${IMAGE_FQN}"
           docker run \
             --volume $(pwd)/tests/full:/srv/jekyll \
-            --env DEBUG=true \
+            --env DEBUG=false \
             --env GITHUB_BRANCH=${{ needs.variables.outputs.build_branch }} \
             --env GITHUB_REPOSITORY_URL=${{ github.event.repository.html_url }} \
             "${IMAGE_FQN}" \
             build \
             --verify \
             --env=production \
-            --log-level=debug \
+            --log-level=error \
             --site-url=https://example.com/ \
             --ignore-url '%r{[/.]?page1}' \
             --ignore-url http://www.wikipedia.org \
@@ -241,13 +236,13 @@ jobs:
           docker pull "${IMAGE_FQN}"
           docker run \
             --volume $(pwd)/tests/full:/srv/jekyll \
-            --env DEBUG=true \
+            --env DEBUG=false \
             --env GITHUB_BRANCH=${{ needs.variables.outputs.build_branch }} \
             --env GITHUB_REPOSITORY_URL=${{ github.event.repository.html_url }} \
             "${IMAGE_FQN}" \
             build \
             --env=production \
-            --log-level=debug \
+            --log-level=error \
             --site-url=https://swedbankpay.github.io/jekyll-plantuml-docker/
 
       - name: Verify base URL
@@ -286,11 +281,11 @@ jobs:
             --env GIT_DEPLOY_REPO="${GIT_DEPLOY_REPO}" \
             --env PAGES_REPO_NWO="${{ github.repository }}" \
             --env JEKYLL_GITHUB_TOKEN="${{ secrets.GITHUB_TOKEN }}" \
-            --env DEBUG="true" \
+            --env DEBUG=false \
             ${IMAGE_NAME}:${IMAGE_TAG} \
             deploy \
             --env=production \
-            --log-level=debug
+            --log-level=error
 
   cleanup:
     runs-on: ubuntu-latest