Update golang to 1.20.5

Used the last version of golang, updating the github workflows and the
Dockerfile.

It also includes a update on the ubuntu version.

.github/workflows/build-integration.yml

@@ -27,7 +27,7 @@ jobs:
       - uses: actions/checkout@v3.5.3
       - uses: actions/setup-go@v4
         with:
-          go-version: 1.19.3
+          go-version: 1.20.5
       - uses: actions/setup-node@v3
         with:
           node-version: 10
@@ -44,7 +44,7 @@ jobs:
       - uses: actions/checkout@v3.5.3
       - uses: actions/setup-go@v4
         with:
-          go-version: 1.19.3
+          go-version: 1.20.5
       - name: Ensure no go vet errors
         run: |
           go vet ./cmd/rbac-manager/...
@@ -59,7 +59,7 @@ jobs:
       - uses: actions/checkout@v3.5.3
       - uses: actions/setup-go@v4
         with:
-          go-version: 1.19.3
+          go-version: 1.20.5
       - name: Install ginkgo test runner
         run: go install github.com/onsi/ginkgo/ginkgo@v1.16.5
       - name: Install Kubebuilder test helpers
@@ -76,9 +76,11 @@ jobs:
       - uses: actions/checkout@v3.5.3
       - uses: actions/setup-go@v4
         with:
-          go-version: 1.19.3
+          go-version: 1.20.5
       - name: Build test binaries
         run: make bin/acceptance.linux_amd64
+        # This tools version don't change that often, it would be a good idea use actions/cache.
+        # maybe same thing with the toolling in the unit-integration
       - name: Install tooling
         run: |-
           sudo bash <<EOF

.github/workflows/release.yml

@@ -52,7 +52,7 @@ jobs:
           fetch-depth: 0
       - uses: actions/setup-go@v4
         with:
-          go-version: 1.19.3
+          go-version: 1.20.5
       - name: Create tag for new version
         run: |
           CURRENT_VERSION="v$(cat VERSION)"

.tool-versions

@@ -1 +1 @@
-golang 1.19.3
+golang 1.20.5

Dockerfile

@@ -1,12 +1,12 @@
 # Build Go binary without cgo dependencies
-FROM golang:1.19.3 as builder
+FROM golang:1.20.5 as builder
 WORKDIR /go/src/github.com/gocardless/theatre
 
 COPY . /go/src/github.com/gocardless/theatre
-RUN make VERSION=$(cat VERSION) build
+RUN make VERSION="$(cat VERSION) build"
 
 # Use ubuntu as our base package to enable generic system tools
-FROM ubuntu:focal-20211006
+FROM ubuntu:jammy-20230522
 
 # Without these certificates we'll fail to validate TLS connections to Google's
 # services.