[Request]: Add support for bind mount in build.

[jglogan]

Feature or enhancement request details

Dockerfile:

FROM alpine:latest
RUN --mount=type=bind,source=/etc,target=/workspace /workspace/tools/bootstrap

mkdir -p tools
cat > /tools/bootstrap <<EOT
#! /bin/bash -ex
echo hello world > /etc/motd
EOT
chmod +x bootstrap
container build --file Dockerfile --tag test .

output today:

% ./build.sh
+ container build --file Dockerfile --tag test .
[+] Building 1.4s (5/5) FINISHED                                                                                                                                                                                        
 => [resolver] fetching image...docker.io/library/alpine:latest                                                                                                                                                    0.0s
 => [internal] load .dockerignore                                                                                                                                                                                  0.1s
 => => transferring context: 2B                                                                                                                                                                                    0.0s
 => [internal] load build context                                                                                                                                                                                  0.1s
 => => transferring context: 25B                                                                                                                                                                                   0.0s
 => oci-layout://docker.io/library/alpine:latest@sha256:51183f2cfa6320055da30872f211093f9ff1d3cf06f39a0bdb212314c5dc7375                                                                                           0.7s
 => => resolve docker.io/library/alpine:latest@sha256:51183f2cfa6320055da30872f211093f9ff1d3cf06f39a0bdb212314c5dc7375                                                                                             0.3s
 => => sha256:0bd713040ebbdef7247f70b0753f8fb2f410e8eb358e95af409a8412b9847d78 4.20MB / 4.20MB                                                                                                                     0.1s
 => => extracting sha256:0bd713040ebbdef7247f70b0753f8fb2f410e8eb358e95af409a8412b9847d78                                                                                                                          0.1s
 => ERROR [linux/arm64 stage-0 1/2] RUN --mount=type=bind,source=/etc,target=/workspace /workspace/tools/bootstrap                                                                                                 0.2s
------                                                                                                                                                                                                                  
 > [linux/arm64 stage-0 1/2] RUN --mount=type=bind,source=/etc,target=/workspace /workspace/tools/bootstrap:
0.144 /bin/sh: /workspace/tools/bootstrap: not found
------
Error: unknown (2): failed to solve: process "/bin/sh -c /workspace/tools/bootstrap" did not complete successfully: exit code: 127

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