github: Add prettier lint step.

Author: alexmv

.editorconfig

@@ -14,3 +14,7 @@ switch_case_indent = true
 
 [*.{yaml,yml}]
 indent_size = 2
+
+[*.md]
+indent_size = 2
+max_line_length = 80

.github/workflows/prettier.yaml

@@ -0,0 +1,26 @@
+---
+name: Lint markdown files prettier
+
+on:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  prettier:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v5
+      - uses: creyD/prettier_action@v4.6
+        with:
+          dry: true
+          prettier_options: "--write **/*.md"
+      - name: Check for any diff
+        run: |
+          if ! git diff --exit-code; then
+            echo "Changes found!"
+            git status
+            git diff
+            exit 1
+          fi

CODE_OF_CONDUCT.md

@@ -8,19 +8,19 @@ In the interest of fostering an open and welcoming environment, we as contributo
 
 Examples of behavior that contributes to creating a positive environment include:
 
-* Using welcoming and inclusive language
-* Being respectful of differing viewpoints and experiences
-* Gracefully accepting constructive criticism
-* Focusing on what is best for the community
-* Showing empathy towards other community members
+- Using welcoming and inclusive language
+- Being respectful of differing viewpoints and experiences
+- Gracefully accepting constructive criticism
+- Focusing on what is best for the community
+- Showing empathy towards other community members
 
 Examples of unacceptable behavior by participants include:
 
-* The use of sexualized language or imagery and unwelcome sexual attention or advances
-* Trolling, insulting/derogatory comments, and personal or political attacks
-* Public or private harassment
-* Publishing others' private information, such as a physical or electronic address, without explicit permission
-* Other conduct which could reasonably be considered inappropriate in a professional setting
+- The use of sexualized language or imagery and unwelcome sexual attention or advances
+- Trolling, insulting/derogatory comments, and personal or political attacks
+- Public or private harassment
+- Publishing others' private information, such as a physical or electronic address, without explicit permission
+- Other conduct which could reasonably be considered inappropriate in a professional setting
 
 ## Our Responsibilities
 

README.md

@@ -217,15 +217,15 @@ proxies][other-proxy].
 [other-proxy]: https://zulip.readthedocs.io/en/latest/production/reverse-proxies.html#other-proxies
 
 **Outgoing proxy**: Zulip uses [Smokescreen][smokescreen] to proxy all
-outgoing HTTP connections and prevent SSRF attacks.  If you have
+outgoing HTTP connections and prevent SSRF attacks. If you have
 private IPs (e.g., outgoing webhook hosts on private IPs), you can set
 `PROXY_ALLOW_ADDRESSES` or `PROXY_ALLOW_RANGES` to comma-separated
 lists of IP addresses or CIDR ranges.
 
 [smokescreen]: https://zulip.readthedocs.io/en/latest/production/deployment.html#customizing-the-outgoing-http-proxy
 
 **Incoming email**: The Docker image exposes port 25, which is already
-configured with Zulip's incoming email server.  To use it, publish
+configured with Zulip's incoming email server. To use it, publish
 port 25 of the Docker container, set `SETTING_EMAIL_GATEWAY_PATTERN`,
 and add an MX record to your DNS configuration pointing to the Docker
 container's public hostname (or wherever you chose to publicly expose

custom_zulip_files/README.custom_zulip_files.md

@@ -1,5 +1,5 @@
 The custom_zulip_files mechanism allows you to test edits to Zulip
-before making changes in the upstream repo.  It works by copying the
+before making changes in the upstream repo. It works by copying the
 contents of this directory on top of the main zulip/zulip checkout as
 part of the Docker build process.
 

kubernetes/chart/zulip/CHANGELOG.md

@@ -141,7 +141,6 @@
 ## [0.3.0] - 2022-04-21
 
 - Update dependencies:
-
   - Helm charts:
 
     | Repository                         | Name       | Version |