add env variable COMMITS_TO_FETCH to remove magic number 3

.github/workflows/c3-e2e-dependabot.yml

@@ -10,6 +10,11 @@ on:
 env:
   node-version: 18.17.1
   bun-version: 1.0.3
+  # we need to fetch 3 commits because dependabot generates one, our changeset
+  # generation workflow generates another and we need the parent of both commits
+  # so that we can diff it (`git diff HEAD~n`) and see what package changed in
+  # the `package.json` file
+  COMMITS_TO_FETCH: 3
 
 jobs:
   get-dependabot-bumped-framework:
@@ -23,7 +28,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v3
         with:
-          fetch-depth: 3
+          fetch-depth: ${{ env.COMMITS_TO_FETCH }}
 
       - name: detect-bumped-framework
         id: detect
@@ -55,7 +60,7 @@ jobs:
       - name: Checkout Repo
         uses: actions/checkout@v3
         with:
-          fetch-depth: 3
+          fetch-depth: ${{ env.COMMITS_TO_FETCH }}
 
       - name: Install Dependencies
         uses: ./.github/actions/install-dependencies

.github/workflows/c3-e2e.yml

@@ -8,6 +8,12 @@ on:
 env:
   node-version: 18.17.1
   bun-version: 1.0.3
+  # we need to fetch 3 commits because dependabot generates one, our changeset
+  # generation workflow generates another and we need the parent of both commits
+  # so that we can diff it (`git diff HEAD~n`) and see what package changed in
+  # the `package.json` file
+  COMMITS_TO_FETCH: 3
+
 jobs:
   e2e:
     # Note: please keep this job in sync with the e2e-only-dependabot-bumped-framework one
@@ -32,7 +38,7 @@ jobs:
       - name: Checkout Repo
         uses: actions/checkout@v3
         with:
-          fetch-depth: 3
+          fetch-depth: ${{ env.COMMITS_TO_FETCH }}
 
       - name: Install Dependencies
         uses: ./.github/actions/install-dependencies