chore: delete circle.yml

CircleCI hasn't been used in 11+ months.

Fixes #3072

circle.yml

@@ -1,76 +0,0 @@
-version: 2.1
-executors:
-  docker-publisher:
-    docker:
-      - image: circleci/buildpack-deps:stretch
-jobs:
-  test_demo:
-    working_directory: /test
-    docker:
-      - image: rust:1.45-stretch
-    steps:
-      - checkout
-      - run:
-          command: |
-            cargo build
-      - run:
-          command: |
-            ./target/debug/stacks-inspect local initialize db &&
-            ./target/debug/stacks-inspect local check sample-contracts/tokens.clar db &&
-            ./target/debug/stacks-inspect local launch S1G2081040G2081040G2081040G208105NK8PE5.tokens sample-contracts/tokens.clar db &&
-            ./target/debug/stacks-inspect local check sample-contracts/names.clar db &&
-            ./target/debug/stacks-inspect local launch S1G2081040G2081040G2081040G208105NK8PE5.names sample-contracts/names.clar db &&
-            ./target/debug/stacks-inspect local execute db S1G2081040G2081040G2081040G208105NK8PE5.tokens mint! SZ2J6ZY48GV1EZ5V2V5RB9MP66SW86PYKKQ9H6DPR u100000
-      - run:
-          command: |
-            echo "(get-balance 'SZ2J6ZY48GV1EZ5V2V5RB9MP66SW86PYKKQ9H6DPR)" | ./target/debug/stacks-inspect local eval S1G2081040G2081040G2081040G208105NK8PE5.tokens db
-  unit_tests_with_cov:
-    machine: true
-    working_directory: ~/blockstack
-    steps:
-      - checkout
-      - run:
-          name: Coverage via tarpaulin
-          command: |
-            docker run --security-opt seccomp=unconfined -v "${PWD}:/volume" xd009642/tarpaulin \
-            bash -c "cargo tarpaulin -v --workspace -t 300 -o Xml"
-          no_output_timeout: 200m
-      - run:
-          name: Upload to codecov.io
-          command: |
-            bash <(curl -s https://codecov.io/bash)
-  unit_tests:
-    docker:
-      - image: rust:1.40-stretch
-    working_directory: ~/blockstack
-    steps:
-      - checkout
-      - run:
-          no_output_timeout: 200m
-          command: |
-            cargo test -j 1 --workspace --exclude clarity
-  all_tests:
-    docker:
-      - image: rust:1.40-stretch
-    working_directory: ~/blockstack
-    steps:
-      - checkout
-      - run:
-          no_output_timeout: 200m
-          command: |
-            cargo test --workspace && cargo test -- --ignored --test-threads 1
-workflows:
-  version: 2
-  test:
-    jobs:
-      - unit_tests
-      - test_demo
-# disable `all_tests` for now, because the circle builder
-#   OOMs on compile...
-#      - all_tests:
-#          filters:
-#            branches:
-#              only:
-#                - master
-#                - /.*net.*/
-#                - /.*marf.*/