Fix #331, Skip documentation deploy job

Moves the branch push check conditional "up" in the documentation build
workflow. The check now happens at the deploy job level instead of the
deploy step step for both the deploy-usersguide and deploy-osalguide.

This saves time by preventing loading extra VMs in pull requests and
other repository push events.

Author: astrogeco

.github/workflows/build-documentation.yml

@@ -153,11 +153,10 @@ jobs:
           key: usersguide-buildnum-${{ github.run_number }}
 
   deploy-usersguide:
-    needs: build-usersguide
-    # Name the Job
     name: Deploy Users Guide
-    # Set the type of machine to run on
     runs-on: ubuntu-18.04
+    needs: build-usersguide    
+    if: ${{ github.event_name == 'push' && contains(github.ref, 'main')}}
 
     steps:
       - name: Cache cFS Build Environment for usersguide
@@ -258,6 +257,7 @@ jobs:
     needs: build-osalguide
     name: Deploy Osal Guide
     runs-on: ubuntu-18.04
+    if: ${{ github.event_name == 'push' && contains(github.ref, 'main')}}
 
     steps:
       - name: Cache cFS Build Environment for osalguide
@@ -268,11 +268,11 @@ jobs:
           key: osalguide-buildnum-${{ github.run_number }}
 
       - name: Deploy to GitHub
-        if: ${{ github.event_name == 'push' && contains(github.ref, 'main')}}
         uses: JamesIves/github-pages-deploy-action@3.7.1
         with:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           BRANCH: gh-pages
           FOLDER: deploy
           CLEAN: false
           SINGLE_COMMIT: true
+