print GITHUB_CONTEXT without using echo

build.yml failed because `echo "$GITHUB_CONTEXT" caused an `argument list too long` error.

Try printing GITHUB_CONTEXT with `printenv` instead, to avoid this.

Author: dhalbert

.github/workflows/build.yml

@@ -13,7 +13,9 @@ jobs:
     - name: Dump GitHub context
       env:
         GITHUB_CONTEXT: ${{ toJson(github) }}
-      run: echo "$GITHUB_CONTEXT"
+      run: |
+        export GITHUB_CONTEXT
+        printenv GITHUB_CONTEXT
     - name: Translate Repo Name For Build Tools filename_prefix
       id: repo-name
       run: |