BuildKit: denied { write } (`scontext=system_u:system_r:container_t:s0:c23,c164 tcontext=unconfined_u:object_r:container_ro_file_t:s0`)

[AkihiroSuda]

RUN ls works, but RUN apk add neofetch does not 😞

# buildctl build --frontend dockerfile.v0 --local dockerfile=. --local context=.
[+] Building 3.3s (5/5) FINISHED                                                                                                           
 => [internal] load .dockerignore                                                                                                     0.1s
 => => transferring context: 2B                                                                                                       0.0s
 => [internal] load build definition from Dockerfile                                                                                  0.1s
 => => transferring dockerfile: 130B                                                                                                  0.0s
 => [internal] load metadata for docker.io/library/alpine:latest                                                                      2.7s
 => CACHED [1/2] FROM docker.io/library/alpine@sha256:bc41182d7ef5ffc53a40b044e725193bc10142a1243f395ee852a8d9730fc2ad                0.1s
 => => resolve docker.io/library/alpine@sha256:bc41182d7ef5ffc53a40b044e725193bc10142a1243f395ee852a8d9730fc2ad                       0.1s
 => ERROR [2/2] RUN apk add neofetch                                                                                                  0.3s
------
 > [2/2] RUN apk add neofetch:
#0 0.260 ERROR: Unable to lock database: Permission denied
#0 0.263 ERROR: Failed to open apk database: Permission denied
------
Dockerfile:2
--------------------
   1 |     FROM alpine
   2 | >>> RUN apk add neofetch
   3 |     
--------------------
error: failed to solve: process "/bin/sh -c apk add neofetch" did not complete successfully: exit code: 99

# ausearch -m avc
time->Wed Oct 19 15:31:03 2022
type=AVC msg=audit(1666193463.724:567): avc:  denied  { write } for  pid=2031 comm="apk" name="lock" dev="overlay" ino=94946 scontext=system_u:system_r:container_t:s0:c23,c164 tcontext=unconfined_u:object_r:container_ro_file_t:s0 tclass=file permissive=0

Originally posted by @AkihiroSuda in #189 (comment)