release.Dockerfile: ping Google PGP key because it's flaking

The Google endpoint for their PGP key is flaking between a PEM and
binary response. We need the binary response, but can't coerce a stable
response. So, pin the public key.

.devcontainer/release.Dockerfile

@@ -11,7 +11,8 @@ RUN apt update -y \
      gpg \
      lsb-release \
      && echo "deb [signed-by=/usr/share/keyrings/cloud.google.gpg] https://packages.cloud.google.com/apt cloud-sdk main" | tee -a /etc/apt/sources.list.d/google-cloud-sdk.list \
-     && curl https://packages.cloud.google.com/apt/doc/apt-key.gpg | tee /usr/share/keyrings/cloud.google.gpg \
+     && echo "xsBNBGKItdQBCADWmKTNZEYWgXy73FvKFY5fRro4tGNa4Be4TZW3wZpct9Cj8EjykU7S9EPoJ3EdKpxFltHRu7QbDi6LWSNA4XxwnudQrYGxnxx6Ru1KBHFxHhLfWsvFcGMwit/znpxtIt9UzqCm2YTEW5NUnzQ4rXYqVQK2FLG4weYJ5bKwkY+ZsnRJpzxdHGJ0pBiqwkMT8bfQdJymUBown+SeuQ2HEqfjVMsIRe0dweD2PHWeWo9fTXsz1Q5abiGckyOVyoN9//DgSvLUocUcZsrWvYPaN+o8lXTO3GYFGNVsx069rxarkeCjOpiQOWrQmywXISQudcusSgmmgfsRZYW7FDBy5MQrABEBAAHNUVJhcHR1cmUgQXV0b21hdGljIFNpZ25pbmcgS2V5IChjbG91ZC1yYXB0dXJlLXNpZ25pbmcta2V5LTIwMjItMDMtMDctMDhfMDFfMDEucHViKcLAYgQTAQgAFgUCYoi11AkQtT3IDRPt7wUCGwMCGQEAAMGoCAB8QBNIIN3Q2D3aahrfkb6axd55zOwR0tnriuJRoPHoNuorOpCv9aWMMvQACNWkxsvJxEF8OUbzhSYjAR534RDigjTetjK2i2wKLz/kJjZbuF4ZXMynCm40eVm1XZqU63U9XR2RxmXppyNpMqQO9LrzGEnNJuh23icaZY6no12axymxcle/+SCmda8oDAfa0iyA2iyg/eU05buZv54MC6RB13QtS+8vOrKDGr7RYp/VYvQzYWm+ck6DvlaVX6VB51BkLl23SQknyZIJBVPm8ttU65EyrrgG1jLLHFXDUqJ/RpNKq+PCzWiyt4uy3AfXK89RczLu3uxiD0CQI0T31u/IzsBNBGKItdQBCADIMMJdRcg0Phv7+CrZz3xRE8Fbz8AN+YCLigQeH0B9lijxkjAFr+thB0IrOu7ruwNY+mvdP6dAewUur+pJaIjEe+4s8JBEFb4BxJfBBPuEbGSxbi4OPEJuwT53TMJMEs7+gIxCCmwioTggTBp6JzDsT/cdBeyWCusCQwDWpqoYCoUWJLrUQ6dOlI7s6p+iIUNIamtyBCwb4izs27HdEpX8gvO9rEdtcb7399HyO3oD4gHgcuFiuZTpvWHdn9WYwPGM6npJNG7crtLnctTR0cP9KutSPNzpySeAniHx8L9ebdD9tNPCWC+OtOcGRrcBeEznkYh1C4kzdP1ORm5upnknABEBAAHCwF8EGAEIABMFAmKItdQJELU9yA0T7e8FAhsMAABJmAgAhRPk/dFj71bU/UTXrkEkZZzE9JzUgan/ttyRrV6QbFZABByf4pYjBj+yLKw3280//JWurKox2uzEq1hdXPedRHICRuh1Fjd00otaQ+wGF3kY74zlWivB6Wp6tnL9STQ1oVYBUv7HhSHoJ5shELyedxxHxurUgFAD+pbFXIiK8cnAHfXTJMcrmPpC+YWEC/DeqIyEcNPkzRhtRSuERXcq1n+KJvMUAKMD/tezwvujzBaaSWapmdnGmtRjjL7IxUeGamVWOwLQbUr+34MwzdeJdcL8fav5LA8Uk0ulyeXdwiAK8FKQsixI+xZvz7HUs8ln4pZwGw/TpvO9cMkHogtgzQ==" \
+        | base64 -d > /usr/share/keyrings/cloud.google.gpg \
      && echo "Add NodeSource keyring for more recent nodejs packages" \
      && export NODE_KEYRING=/usr/share/keyrings/nodesource.gpg \
      && curl -fsSL https://deb.nodesource.com/gpgkey/nodesource.gpg.key | gpg --dearmor | tee "$NODE_KEYRING" >/dev/null \