Sanitize input between PR deployment workflows.

Signed-off-by: Adam Vollrath <adam.d.vollrath@gmail.com>

.github/workflows/uffizzi-preview.yaml

@@ -48,47 +48,37 @@ jobs:
             let fs = require('fs');
             fs.writeFileSync(`${process.env.GITHUB_WORKSPACE}/preview-spec.zip`, Buffer.from(download.data));
 
-      - name: 'Unzip artifact'
-        run: unzip preview-spec.zip
+      - name: 'Accept event from first stage'
+        run: unzip preview-spec.zip event.json
 
       - name: Read Event into ENV
         run: |
-          echo 'EVENT_JSON<<EOF' >> $GITHUB_ENV
-          cat event.json >> $GITHUB_ENV
-          echo -e '\nEOF' >> $GITHUB_ENV
+          echo PR_NUMBER=$(jq '.number | tonumber' < event.json) >> $GITHUB_ENV
+          echo ACTION=$(jq --raw-output '.action | tostring | [scan("\\w+")][0]' < event.json) >> $GITHUB_ENV
+          echo GIT_REF=$(jq --raw-output '.pull_request.head.sha | tostring | [scan("\\w+")][0]' < event.json) >> $GITHUB_ENV
 
       - name: Hash Rendered Manifests File
         id: hash
         # If the previous workflow was triggered by a PR close event, we will not have a manifests file artifact.
-        if: ${{ fromJSON(env.EVENT_JSON).action != 'closed' }}
+        if: ${{ env.ACTION != 'closed' }}
         run: |
+          unzip preview-spec.zip manifests.rendered.yml
           ls
           echo "MANIFESTS_FILE_HASH=$(md5sum manifests.rendered.yml | awk '{ print $1 }')" >> $GITHUB_ENV
 
       - name: Cache Manifests File
-        if: ${{ fromJSON(env.EVENT_JSON).action != 'closed' }}
+        if: ${{ env.ACTION != 'closed' }}
         uses: actions/cache@v3.3.2
         with:
           path: manifests.rendered.yml
           key: ${{ env.MANIFESTS_FILE_HASH }}
 
-      - name: Read PR Number From Event Object
-        id: pr
-        run: echo "PR_NUMBER=${{ fromJSON(env.EVENT_JSON).number }}" >> $GITHUB_ENV
-
-      - name: Read Event Type from Event Object
-        id: action
-        run: echo "ACTION=${{ fromJSON(env.EVENT_JSON).action }}" >> $GITHUB_ENV
-
-      - name: Read Git Ref From Event Object
-        id: ref
-        run: echo "GIT_REF=${{ fromJSON(env.EVENT_JSON).pull_request.head.sha }}" >> $GITHUB_ENV
-
       - name: DEBUG - Print Job Outputs
         if: ${{ runner.debug }}
         run: |
           echo "PR number: ${{ env.PR_NUMBER }}"
           echo "Git Ref: ${{ env.GIT_REF }}"
+          echo "Action: ${{ env.ACTION }}"
           echo "Manifests file hash: ${{ env.MANIFESTS_FILE_HASH }}"
           cat event.json