Error: Command failed: heroku container:push web --app mappable-test-server › Warning: heroku update available from 8.1.9 to 8.3.1. #0 building with "default" instance using docker driver #1 [internal] load build definition from Dockerfile #1 transferring dockerfile: 555B done #1 DONE 0.0s #2 [internal] load .dockerignore #2 transferring context: 240B done #2 DONE 0.0s #3 [internal] load metadata for docker.io/library/node:16.15.0-alpine #3 DONE 0.1s #4 [internal] load build context #4 transferring context: 2.04kB done #4 DONE 0.0s #5 [build 2/5] WORKDIR /opt/server #5 CACHED #6 [build 3/5] COPY . . #6 CACHED #7 [build 4/5] RUN npm ci #7 CACHED #8 [production 4/10] COPY ./docs/ ./docs/ #8 CACHED #9 [production 5/10] COPY ./package-lock.json ./package-lock.json #9 CACHED #10 [build 5/5] RUN npm run build #10 CACHED #11 [production 6/10] COPY ./package.json ./package.json #11 CACHED #12 [production 3/10] COPY --from=build /opt/server/dist dist #12 CACHED #13 [production 7/10] COPY ./.env ./.env #13 ERROR: failed to calculate checksum of ref moby::q4h3gw5q571rjqn6f3a57x0bm: "/.env": not found #14 [build 1/5] FROM docker.io/library/node:16.15.0-alpine@sha256:1a9a71ea86aad332aa7740316d4111ee1bd4e890df47d3b5eff3e5bded3b3d10 #14 resolve docker.io/library/node:16.15.0-alpine@sha256:1a9a71ea86aad332aa7740316d4111ee1bd4e890df47d3b5eff3e5bded3b3d10 done #14 sha256:bb776153f81d6e931211e3cadd7eef92c811e7086993b685d1f40242d486b9bb 1.16kB / 1.16kB done #14 sha256:e5065cc780745864eeee3280fe347b33e90961c98c7d3e14d5b660e16aef24ce 6.58kB / 6.58kB done #14 sha256:1a9a71ea86aad332aa7740316d4111ee1bd4e890df47d3b5eff3e5bded3b3d10 1.43kB / 1.43kB done #14 CANCELED ------ > [production 7/10] COPY ./.env ./.env: ------ Dockerfile:19 -------------------- 17 | COPY ./package-lock.json ./package-lock.json 18 | COPY ./package.json ./package.json 19 | >>> COPY ./.env ./.env 20 | 21 | RUN npm ci --production -------------------- ERROR: failed to solve: failed to compute cache key: failed to calculate checksum of ref moby::q4h3gw5q571rjqn6f3a57x0bm: "/.env": not found ▸ Error: docker build exited with Error: 1