ci: update base branch and CI setup in workflows FE-1230 (#138)

- Changed baseBranch in changeset config from "main" to "origin/main".
- Updated CI setup in GitHub Actions to use a specific version of the
node setup action and added node version specification.
- Modified the changeset status command to reference the correct base
branch for better changelog generation.

Copy of Wallet flow.

Author: nelitow

.changeset/config.json

@@ -5,7 +5,7 @@
   "fixed": [["@fuels/*"]],
   "linked": [],
   "access": "public",
-  "baseBranch": "main",
+  "baseBranch": "origin/main",
   "updateInternalDependencies": "patch",
   "snapshot": {
     "useCalculatedVersion": true,

.github/workflows/pr.yaml

@@ -45,10 +45,13 @@ jobs:
           # need this to get full git-history/clone in order to build changelogs and check changesets
           fetch-depth: 0
 
-      - uses: FuelLabs/github-actions/setups/node@master
+      - name: CI Setup
+        uses: FuelLabs/github-actions/setups/node@58bcd91d7246e40938e1971be0b0fe35b253dff0
         with:
+          node-version: 20.11.0
           pnpm-version: 9.5.0
-      - run: pnpm changeset:check
+
+      - run: pnpm changeset status --since=origin/${{ github.base_ref }}
 
   audit:
     name: Audit
@@ -99,4 +102,4 @@ jobs:
           prnumber: ${{ steps.findPr.outputs.number }}
           skip-test: all
           coverage-file: ${{ env.COVERAGE_FILE }}
-          base-coverage-file: ${{ env.COVERAGE_FILE }}
+          base-coverage-file: ${{ env.COVERAGE_FILE }}