Install bash in Firebase Dockerfile (#2996)

This was accidentally removed in #2991 ``` Step #1: exec /usr/bin/firebase.bash: no such file or directory ```
dart-lang · Jun 12, 2024 · b284656 · b284656
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commit b284656
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diff --git a/.cloud_build/firebase/Dockerfile b/.cloud_build/firebase/Dockerfile
@@ -1,5 +1,6 @@
 FROM node:lts-alpine3.14 AS app-env
 
+RUN apk add --no-cache bash
 RUN npm install -g firebase-tools
 
 ADD firebase.bash /usr/bin