fix: update base images to go1.18

[ldez]

#2649 (comment)

[rcbop]

Hi @ldez, can you add an on: workflow_dispatch in the tag workflow and re-trigger this workflow manually to get the go version bump to 1.18 inside the docker image to be published in dockerhub? I see this change happened 3 days ago and the latest v1.45.0 image is 5 days old.

I'm having an error due to the current v1.45-alpine image having go 1.17:

INFO [config_reader] Config search paths: [./ /project / /root]
INFO [config_reader] Used config file .golangci.yml
INFO [lintersdb] Active 27 linters: [deadcode depguard dogsled dupl errcheck exportloopref funlen gochecknoinits goconst gocritic gocyclo gofmt goimports gomnd goprintffuncname gosec govet ineffassign lll misspell nakedret revive structcheck typecheck unconvert varcheck whitespace]
INFO [loader] Go packages loading at mode 575 (compiled_files|imports|types_sizes|deps|exports_file|files|name) took 6.014621836s
INFO [runner/filename_unadjuster] Pre-built 0 adjustments in 1.409458ms
INFO [linters context/goanalysis] analyzers took 691.562291ms with top 10 stages: inspect: 336.787872ms, ctrlflow: 191.750674ms, printf: 162.630659ms, bools: 90.625µs, structtag: 77.458µs, goprintffuncname: 54.042µs, exportloopref: 39.417µs, the_only_name: 14.5µs, errcheck: 11.834µs, unconvert: 7.333µs
WARN [runner] Can't run linter goanalysis_metalinter: inspect: failed to load package cmd: could not load export data: no export data for "gitlab.mycompany.org/myapp/cmd"
INFO [runner] processing took 2.791µs with stages: max_same_issues: 542ns, nolint: 417ns, skip_dirs: 333ns, max_from_linter: 208ns, skip_files: 167ns, exclude: 166ns, source_code: 166ns, filename_unadjuster: 125ns, autogenerated_exclude: 84ns, cgo: 83ns, identifier_marker: 83ns, uniq_by_line: 83ns, max_per_file_from_linter: 42ns, path_prefixer: 42ns, severity-rules: 42ns, exclude-rules: 42ns, diff: 42ns, path_shortener: 42ns, sort_results: 41ns, path_prettifier: 41ns
INFO [runner] linters took 4.234354419s with stages: goanalysis_metalinter: 4.23431671s
ERRO Running error: 1 error occurred:
	* can't run linter goanalysis_metalinter: inspect: failed to load package cmd: could not load export data: no export data for "gitlab.mycompany.org/myapp/cmd"

INFO Memory: 104 samples, avg is 104.9MB, max is 511.9MB
INFO Execution took 10.256475505s

when running the same golangci-lint binary inside a go 1.18 environment it works fine

[ldez]

#2649 (comment)