[v0.10] inline cache: fix blob indexes by uncompressed digest

[tonistiigi]

pick #3580

Signed-off-by: Tonis Tiigi tonistiigi@gmail.com
(cherry picked from commit 39ff1c0)

[crazy-max]

CI issue but fine to merge as this is only for vendoring on moby: https://github.com/moby/buildkit/actions/runs/4100120702/jobs/7076214226#step:6:659

#16 [linux/amd64 internal] load metadata for docker.io/library/alpine:3.15
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 > [linux/amd64->riscv64 runc 3/3] RUN --mount=from=runc-src,src=/usr/src/runc,target=. --mount=target=/root/.cache,type=cache   CGO_ENABLED=1 xx-go build -mod=vendor -ldflags '-extldflags -static' -tags 'apparmor seccomp netgo cgo static_build osusergo' -o /usr/bin/runc ./ &&   xx-verify --static /usr/bin/runc:
#61 133.0 /usr/bin/riscv64-alpine-linux-musl-ld: failed to merge target specific data of file $WORK/b192/_x006.o
#61 133.0 /usr/bin/riscv64-alpine-linux-musl-ld: failed to merge target specific data of file $WORK/b192/_x007.o
#61 133.0 /usr/bin/riscv64-alpine-linux-musl-ld: failed to merge target specific data of file $WORK/b192/_x008.o
#61 133.0 /usr/bin/riscv64-alpine-linux-musl-ld: failed to merge target specific data of file $WORK/b192/_x009.o
#61 133.0 /usr/bin/riscv64-alpine-linux-musl-ld: failed to merge target specific data of file $WORK/b192/_x010.o
#61 133.0 /usr/bin/riscv64-alpine-linux-musl-ld: -march=rv64i2p1_m2p0_a2p1_f2p2_d2p2_c2p0_zicsr2p0_zifencei2p0_zmmul1p0: unknown z ISA extension `zmmul'
#61 133.0 /usr/bin/riscv64-alpine-linux-musl-ld: failed to merge target specific data of file /riscv64-alpine-linux-musl//usr/lib/gcc/riscv64-alpine-linux-musl/12.2.1/crtendS.o
#61 133.0 /usr/bin/riscv64-alpine-linux-musl-ld: -march=rv64i2p1_m2p0_a2p1_f2p2_d2p2_c2p0_zicsr2p0_zifencei2p0_zmmul1p0: unknown z ISA extension `zmmul'
#61 133.0 /usr/bin/riscv64-alpine-linux-musl-ld: failed to merge target specific data of file /riscv64-alpine-linux-musl//usr/lib/gcc/riscv64-alpine-linux-musl/12.2.1/crtn.o
#61 133.0 clang-12: error: linker command failed with exit code 1 (use -v to see invocation)