[CI] Use badge in gist for rules number in README

This simplifies the workflow code and remove the need for the noisy
commits in capa-rules. We still need the commits in capa to sync the
submodule.

.github/workflows/sync.yml

@@ -8,21 +8,19 @@ jobs:
  steps:
  - name: Checkout capa-rules
  uses: actions/checkout@v3
- - name: Update rules number badge in README
+ - name: Count rules
  run: |
  num_rules=$(find . -type f -name '*.yml' -not -path './.github/*' | wc -l)
- sed -i "s/rules-[0-9]*-blue\.svg/rules-$num_rules-blue.svg/" README.md
- - name: Commit changes
- run: |
- git config user.email 'capa-dev@mandiant.com'
- git config user.name 'Capa Bot'
- # Do not fail the action if rules number doesn't change
- git add -A
- git diff-index --quiet HEAD || git commit -am 'Update rules number badge'
- - name: Push changes to capa-rules
- uses: ad-m/github-push-action@master
+ echo "num_rules=$num_rules" >> $GITHUB_ENV
+ - name: Update dynamic badge gist
+ uses: schneegans/dynamic-badges-action@e9a478b16159b4d31420099ba146cdc50f134483 # v1.7.0
  with:
- github_token: ${{ secrets.GITHUB_TOKEN }}
+ auth: ${{ secrets.GITHUB_TOKEN }}
+ gistID: 6d7960e911f48b3b74916df8988cf0f3
+ filename: rules_badge.svg
+ label: rules
+ message: ${{ env.num_rules }}
+ color: blue
 
  sync_submodule_capa:
  runs-on: ubuntu-20.04
@@ -43,10 +41,6 @@ jobs:
  ref: master
  path: rules
  fetch-depth: 100 # needed so that `git diff` finds `github.event.before`
- - name: Update rules number badge in README
- run: |
- num_rules=$(find rules -type f -name '*.yml' -not -path 'rules/.github/*' | wc -l)
- sed -i "s/rules-[0-9]*-blue\.svg/rules-$num_rules-blue.svg/" README.md
  - name: Update number of new rules in CHANGELOG
  run: |
  new_rules=$(git -C rules diff -M --summary ${{ github.event.before }} | grep create | grep .yml | wc -l)

README.md

@@ -1,7 +1,7 @@
 # capa rules
 
 [![Rule linter status](https://github.com/mandiant/capa-rules/workflows/CI/badge.svg)](https://github.com/mandiant/capa-rules/actions?query=workflow%3A%22CI%22)
-[![Number of rules](https://img.shields.io/badge/rules-871-blue.svg)](rules)
+[![Number of rules](https://gist.githubusercontent.com/capa-bot/6d7960e911f48b3b74916df8988cf0f3/raw/rules_badge.svg)](rules)
 [![License](https://img.shields.io/badge/license-Apache--2.0-green.svg)](LICENSE.txt)
 
 This is the standard collection of rules for [capa](https://github.com/mandiant/capa) - the tool to automatically identify capabilities of programs.