[ag] Update dockerfile to match config in passing local build

* PROBLEM: the build fails on gitlab in a debian-based docker container
* BUT: i (@aguestuser) have a recently-achieved passing build on a
  debian laptop
* ATTEMPTED SOLUTION: construct a dockerfile that matches my local
  configuration as precisely as possible
* PROGRESS: the build gets further than it did before -- getting part of
  the way through the `buildNative` gradle script before failing
* REMAINING FAILURE: several arm64 cross-compile steps in the
  `ndk-build` step fail because they depend on
  [neon](https://developer.android.com/ndk/guides/cpu-arm-neon.html):

```shell
[arm64-v8a] Compile        : crypto_static <= aesv8-armx-64.S
openssl/crypto/aes/asm/aesv8-armx-64.S:35:2: error: instruction requires: neon
 eor v0.16b,v0.16b,v0.16b
 ^
openssl/crypto/aes/asm/aesv8-armx-64.S:36:2: error: instruction requires: neon
 ld1 {v3.16b},[x0],#16
 ^
openssl/crypto/aes/asm/aesv8-armx-64.S:38:2: error: instruction requires: neon
 ld1 {v1.4s,v2.4s},[x3],#32
```

* PROPOSED NEXT STEPS:
  * consult team to see if there's any collective wisdom about `neon`
  * look for ways to analyze diff of c dependencies in local machine
    v. docker instance
  * consider using ubuntu or debian:sid as the base image for the
    android container?

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