Use Go Modules (#274)

And while we're at it, upgrade to Go 1.20. In the process I had to
change a lot of the dependencies. Some because the dependencies wouldn't
resolve using Go modules, some because they were incompatible with
others. The long and the short of it is: 1) the kubernetes dependency
ecosystem is very rough and 2) this should be carefully validated during
rollout given the number of dependency shifts.

Some other minor notes include some lint changes, or rewriting a very
small bit of code to drop a dependency to have one less to fight with.

---------

Co-authored-by: Seth Saperstein <[email protected]>

.github/workflows/actions.yml

@@ -21,9 +21,7 @@ jobs:
       - name: install go
         uses: actions/setup-go@v2
         with:
-          go-version: 1.12
-      - name: install
-        run: make install
+          go-version: "1.20"
       - name: test
         run: make test_unit
   lint:
@@ -42,9 +40,7 @@ jobs:
       - name: install go
         uses: actions/setup-go@v2
         with:
-          go-version: 1.12
-      - name: install
-        run: make install
+          go-version: "1.20"
       - name: test
         run: make lint
   integration-tests:
@@ -63,7 +59,7 @@ jobs:
       - name: install go
         uses: actions/setup-go@v2
         with:
-          go-version: 1.12
+          go-version: "1.20"
       - name: install
         run: integ/install.sh
       - name: setup

Dockerfile

@@ -1,28 +1,24 @@
-FROM golang:1.13.4-alpine3.10 as builder
+FROM golang:1.20.2-alpine3.17 as builder
 RUN apk add git openssh-client make curl bash
 
-COPY boilerplate/lyft/golang_test_targets/dep_install.sh /go/src/github.com/lyft/flinkk8soperator/
-
 # COPY only the dep files for efficient caching
-COPY Gopkg.* /go/src/github.com/lyft/flinkk8soperator/
+COPY go.mod go.sum /go/src/github.com/lyft/flinkk8soperator/
 WORKDIR /go/src/github.com/lyft/flinkk8soperator
 
 # Pull dependencies
-RUN : \
-  && sh dep_install.sh \
-  && dep ensure -vendor-only
+RUN go mod download
 
 # COPY the rest of the source code
 COPY . /go/src/github.com/lyft/flinkk8soperator/
 
 # This 'linux_compile' target should compile binaries to the /artifacts directory
 # The main entrypoint should be compiled to /artifacts/flinkk8soperator
-RUN make linux_compile
+RUN go mod vendor && make linux_compile
 
 # update the PATH to include the /artifacts directory
 ENV PATH="/artifacts:${PATH}"
 
 # This will eventually move to centurylink/ca-certs:latest for minimum possible image size
-FROM alpine:3.10
+FROM alpine:3.17
 COPY --from=builder /artifacts /bin
 CMD ["flinkoperator"]