Replace github.event usage with env variables (#648)

Replace direct github.event usage with top-level env variables.

Author: thpierce

.github/workflows/post_release_version_bump.yml

@@ -29,8 +29,7 @@ jobs:
 
       - name: Extract Major.Minor Version and setup Env variable
         run: |
-          echo "VERSION=${{ github.event.inputs.version }}" >> $GITHUB_ENV
-          echo "MAJOR_MINOR=$(echo ${{ github.event.inputs.version }} | sed -E 's/([0-9]+\.[0-9]+)\.[0-9]+/\1/')" >> $GITHUB_ENV
+          echo "MAJOR_MINOR=$(echo ${{ env.VERSION }} | sed -E 's/([0-9]+\.[0-9]+)\.[0-9]+/\1/')" >> $GITHUB_ENV
 
       - name: Get current major.minor version from main branch
         id: get_version
@@ -87,8 +86,7 @@ jobs:
 
       - name: Extract Major.Minor Version and setup Env variable
         run: |
-          echo "VERSION=${{ github.event.inputs.version }}" >> $GITHUB_ENV
-          echo "MAJOR_MINOR=$(echo ${{ github.event.inputs.version }} | sed -E 's/([0-9]+\.[0-9]+)\.[0-9]+/\1/')" >> $GITHUB_ENV
+          echo "MAJOR_MINOR=$(echo ${{ env.VERSION }} | sed -E 's/([0-9]+\.[0-9]+)\.[0-9]+/\1/')" >> $GITHUB_ENV
 
       - name: Determine release branch and checkout
         run: |

.github/workflows/pre_release_prepare.yml

@@ -54,8 +54,7 @@ jobs:
 
       - name: Extract Major.Minor Version and setup Env variable
         run: |
-          echo "VERSION=${{ github.event.inputs.version }}" >> $GITHUB_ENV
-          echo "MAJOR_MINOR=$(echo ${{ github.event.inputs.version }} | sed -E 's/([0-9]+\.[0-9]+)\.[0-9]+/\1/')" >> $GITHUB_ENV
+          echo "MAJOR_MINOR=$(echo ${{ env.VERSION }} | sed -E 's/([0-9]+\.[0-9]+)\.[0-9]+/\1/')" >> $GITHUB_ENV
 
       - name: Create branches
         run: |