fix: prevent script injection in workflows (release/v0.12.x) (#632)

Move github.event references to env vars to prevent script injection
vulnerabilities in run steps.

This change follows the same pattern as the main branch fix.

By submitting this pull request, I confirm that you can use, modify,
copy, and redistribute this contribution, under the terms of your
choice.

Author: thpierce

.github/workflows/post-release-version-bump.yml

@@ -8,6 +8,7 @@ on:
         required: true
 
 env:
+  VERSION: ${{ github.event.inputs.version }}
   AWS_DEFAULT_REGION: us-east-1
 
 permissions:
@@ -96,9 +97,9 @@ jobs:
 
       - name: Update version to next development version in main
         run: |
-          DEV_VERSION="${{ github.event.inputs.version }}.dev0"
+          DEV_VERSION="${{ env.VERSION }}.dev0"
           sed -i 's/__version__ = ".*"/__version__ = "'$DEV_VERSION'"/' aws-opentelemetry-distro/src/amazon/opentelemetry/distro/version.py
-          VERSION="${{ github.event.inputs.version }}"
+          VERSION="${{ env.VERSION }}"
           sed -i 's/python:v.*"/python:v'$VERSION'"/' .github/workflows/daily-scan.yml
           git add aws-opentelemetry-distro/src/amazon/opentelemetry/distro/version.py
           git add .github/workflows/daily-scan.yml
@@ -109,7 +110,7 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ env.BOT_TOKEN_GITHUB_RW_PATOKEN }}
         run: |
-          DEV_VERSION="${{ github.event.inputs.version }}.dev0"
+          DEV_VERSION="${{ env.VERSION }}.dev0"
           gh pr create --title "Post release $VERSION: Update version to $DEV_VERSION" \
                        --body "This PR prepares the main branch for the next development cycle by updating the version to $DEV_VERSION and updating the image version to be scanned to the latest released.
           

.github/workflows/pre-release-prepare.yml

@@ -12,6 +12,8 @@ on:
         default: 'false'
 
 env:
+  VERSION: ${{ github.event.inputs.version }}
+  IS_PATCH: ${{ github.event.inputs.is_patch }}
   AWS_DEFAULT_REGION: us-east-1
 
 permissions:
@@ -56,7 +58,7 @@ jobs:
 
       - name: Create branches
         run: |
-          IS_PATCH=${{ github.event.inputs.is_patch }}
+          IS_PATCH=${{ env.IS_PATCH }}
           if [[ "$IS_PATCH" != "true" && "$IS_PATCH" != "false" ]]; then
             echo "Invalid input for IS_PATCH. Must be 'true' or 'false'."
             exit 1
@@ -102,5 +104,5 @@ jobs:
                        --body "This PR updates the version to ${VERSION}.
           
           By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice." \
-                       --head v${{ github.event.inputs.version }}_release \
+                       --head v${{ env.VERSION }}_release \
                        --base release/v${MAJOR_MINOR}.x

.github/workflows/release-build.yml

@@ -11,6 +11,8 @@ on:
         default: 'us-east-1, us-east-2, us-west-1, us-west-2, ap-south-1, ap-northeast-3, ap-northeast-2, ap-southeast-1, ap-southeast-2, ap-northeast-1, ca-central-1, eu-central-1, eu-west-1, eu-west-2, eu-west-3, eu-north-1, sa-east-1, af-south-1, ap-east-1, ap-south-2, ap-southeast-3, ap-southeast-4, eu-central-2, eu-south-1, eu-south-2, il-central-1, me-central-1, me-south-1, ap-southeast-5, ap-southeast-7, mx-central-1, ca-west-1, cn-north-1, cn-northwest-1'
 
 env:
+  VERSION: ${{ github.event.inputs.version }}
+  AWS_REGIONS: ${{ github.event.inputs.aws_region }}
   AWS_DEFAULT_REGION: us-east-1
   AWS_PUBLIC_ECR_REGION: us-east-1
   AWS_PRIVATE_ECR_REGION: us-west-2
@@ -82,7 +84,7 @@ jobs:
       - name: Set up regions matrix
         id: set-matrix
         env:
-          AWS_REGIONS: ${{ github.event.inputs.aws_region }}
+          AWS_REGIONS: ${{ env.AWS_REGIONS }}
         run: |
           IFS=',' read -ra REGIONS <<< "$AWS_REGIONS"
           MATRIX="["
@@ -191,7 +193,7 @@ jobs:
           file: ./Dockerfile
           platforms: linux/amd64,linux/arm64
           tags: |
-            ${{ env.RELEASE_PUBLIC_REPOSITORY }}:v${{ github.event.inputs.version }}
+            ${{ env.RELEASE_PUBLIC_REPOSITORY }}:v${{ env.VERSION }}
 
       # Publish to private ECR
       - name: Build and push private ECR image
@@ -202,7 +204,7 @@ jobs:
           file: ./Dockerfile
           platforms: linux/amd64,linux/arm64
           tags: |
-            ${{ env.RELEASE_PRIVATE_REPOSITORY }}:v${{ github.event.inputs.version }}
+            ${{ env.RELEASE_PRIVATE_REPOSITORY }}:v${{ env.VERSION }}
   
   publish-layer-prod:
     runs-on: ubuntu-latest
@@ -450,4 +452,4 @@ jobs:
              ${{ env.ARTIFACT_NAME }} \
              ${{ env.ARTIFACT_NAME }}.sha256 \
              layer.zip \
-             layer.zip.sha256
+             layer.zip.sha256