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Secrets not working as expected (mount fails)

See original GitHub issue

Troubleshooting

Before submitting a bug report please read the Troubleshooting doc.

Behaviour

A secret mount is not made available to the Dockerfile (apparently)

Steps to reproduce this issue

Create the following Dockerfile

# syntax = docker/dockerfile:1.3

FROM alpine:3.14

RUN --mount=type=secret,id=JFROG_PASS \
  cat /run/secrets/JFROG_PASS


RUN wget --user ${JFROG_USER} --password ${JFROG_PASS} "https://my/jfrog/binary"

Execute the following action

      - name: build and push to local registry
        uses: docker/build-push-action@v3
        with:
          context: ${{ inputs.context }}
          file: ${{ inputs.context }}/${{ inputs.dockerfile }}
          no-cache: ${{ inputs.no_cache }}
          build-args: ${{ inputs.build_args }}
          secrets: |
            "JFROG_PASS=${{ secrets.MY_PASSWORD }}"
          push: true
          tags: ${{ env.LOCAL_IMAGE }}

Expected behaviour

Tell us what should happen

The wget command inside the Dockerfile should have succeeded (the values have been tested)

Actual behaviour

Tell us what happens instead

The process of mount fails, check logs

Logs

#9 [stage-0 2/8] RUN --mount=type=secret,id=JFROG_PASS   cat /run/secrets/JFROG_PASS
#0 0.062 cat: can't open '/run/secrets/JFROG_PASS': No such file or directory
#9 ERROR: process "/bin/sh -c cat /run/secrets/JFROG_PASS" did not complete successfully: exit code: 1
------
 > [stage-0 2/8] RUN --mount=type=secret,id=JFROG_PASS   cat /run/secrets/JFROG_PASS:
#0 0.062 cat: can't open '/run/secrets/JFROG_PASS': No such file or directory
------
Dockerfile:5
--------------------
   4 |     
   5 | >>> RUN --mount=type=secret,id=JFROG_PASS \
   6 | >>>   cat /run/secrets/JFROG_PASS
   7 |     
--------------------
ERROR: failed to solve: process "/bin/sh -c cat /run/secrets/JFROG_PASS" did not complete successfully: exit code: 1
Error: buildx failed with: ERROR: failed to solve: process "/bin/sh -c cat /run/secrets/JFROG_PASS" did not complete successfully: exit code: 1