ci: make the commit lint job a reusable action

.github/actions/lint_workflow/action.yml

@@ -0,0 +1,41 @@
+name: 'Lint Commits'
+runs:
+  using: 'composite'
+  steps:
+      - name: Checkout
+        if: github.event_name != 'pull_request'
+        uses: actions/checkout@$CHECKOUT_VERSION 
+        with:
+          fetch-depth: 0 # checkout full tree
+
+      - name: Checkout (Pull Request)
+        if: github.event_name == 'pull_request'
+        uses: actions/checkout@$CHECKOUT_VERSION 
+        with:
+          fetch-depth: 0 # checkout full tree
+          ref: ${{ github.event.pull_request.head.sha }}
+
+      - name: Get commit information from Github (Pull Request)
+        if: github.event_name == 'pull_request'
+        run: gh api repos/${REPO_NAME}/pulls/${{ github.event.number }}/commits > commits.json
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Set FIRST_COMMIT To Begin Linting (Pull Request)
+        if: github.event_name == 'pull_request'
+        run: |
+          pull_request_commits_length=$(cat commits.json | jq '. | length')
+          echo "Number of commits in pull requests are $pull_request_commits_length"
+          echo "FIRST_COMMIT=HEAD~${pull_request_commits_length}" >> $GITHUB_ENV
+      
+      - name: Check no merge commits
+        run: |
+          merge_commit_count=$(git rev-list --no-walk --count --merges $FIRST_COMMIT..HEAD)
+          if [ "$merge_commit_count" != "0" ]; then
+            echo "
+              Our develop branch follows a linear history and cannot have merge commits.
+              Please rebase to develop.
+            " && exit 1
+          fi
+
+      

.github/workflows/all.yml

@@ -33,33 +33,12 @@ jobs:
     env:
       FIRST_COMMIT: 2fd0d36fe6ae0c2d527368683ec3a6352617b381
       CONTRIBUTORS_CSV_PATH: .github/CONTRIBUTORS.csv
+      CHECKOUT_VERSION: 8ade135a41bc03ea155e62e844d188df1ea18608
+      REPO_NAME: build-trust/ockam
 
     steps:
-      - name: Checkout
-        if: github.event_name != 'pull_request'
-        uses: actions/checkout@8ade135a41bc03ea155e62e844d188df1ea18608
-        with:
-          fetch-depth: 0 # checkout full tree
-
-      - name: Checkout (Pull Request)
-        if: github.event_name == 'pull_request'
-        uses: actions/checkout@8ade135a41bc03ea155e62e844d188df1ea18608
-        with:
-          fetch-depth: 0 # checkout full tree
-          ref: ${{ github.event.pull_request.head.sha }}
-
-      - name: Get commit information from Github (Pull Request)
-        if: github.event_name == 'pull_request'
-        run: gh api repos/build-trust/ockam/pulls/${{ github.event.number }}/commits > commits.json
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-
-      - name: Set FIRST_COMMIT To Begin Linting (Pull Request)
-        if: github.event_name == 'pull_request'
-        run: |
-          pull_request_commits_length=$(cat commits.json | jq '. | length')
-          echo "Number of commits in pull requests are $pull_request_commits_length"
-          echo "FIRST_COMMIT=HEAD~${pull_request_commits_length}" >> $GITHUB_ENV
+      - name: Run Composite Action
+        uses: ./.github/actions/lint_workflow/action.yml
 
       - name: Check FIRST_COMMIT is ancestor of HEAD
         run: |
@@ -78,16 +57,6 @@ jobs:
             https://github.com/build-trust/ockam/tree/develop
           " && exit 1)
 
-      - name: Check no merge commits
-        run: |
-          merge_commit_count=$(git rev-list --no-walk --count --merges $FIRST_COMMIT..HEAD)
-          if [ "$merge_commit_count" != "0" ]; then
-            echo "
-              Our develop branch follows a linear history and cannot have merge commits.
-              Please rebase to develop.
-            " && exit 1
-          fi
-
       - name: Install Commitlint
         run: npm install --location=global @commitlint/[email protected] # TODO: move to ockam-builder docker image.