chore: add Containerfile for validation

[ernesgonzalez33]

No description provided.

[ernesgonzalez33]

@mnecas @yaacov I'm not able to build this:

❯ podman build . -f build/validation/Containerfile 
[1/2] STEP 1/6: FROM registry.access.redhat.com/ubi9/go-toolset:1.21.11-9 AS forklift-opa
[1/2] STEP 2/6: WORKDIR /opa/app
--> Using cache ceda26e99c6bdaf8699d9af355145aaa9748c1f99279890dbbf72fd600ee9b78
--> ceda26e99c6b
[1/2] STEP 3/6: COPY --chown=1001:0 ./ ./
--> d9d912360975
[1/2] STEP 4/6: ENV GOFLAGS "-mod=vendor -tags=strictfipsruntime"
--> 5a84419eac36
[1/2] STEP 5/6: ENV GOEXPERIMENT strictfipsruntime
--> f8f9f4d2f252
[1/2] STEP 6/6: RUN GOOS=linux GOARCH=amd64 go build -ldflags="-w -s" -o /tmp/opa github.com/open-policy-agent/opa
cannot find module providing package github.com/open-policy-agent/opa: import lookup disabled by -mod=vendor
Error: building at STEP "RUN GOOS=linux GOARCH=amd64 go build -ldflags="-w -s" -o /tmp/opa github.com/open-policy-agent/opa": while running runtime: exit status 1

It asks for the open-policy-agent dependency in the vendor folder and it is actually not there. But trying to add it using go get ... and then go mod vendor changes a lot of things

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 16.28%. Comparing base (db6782b) to head (b3cc2ab).
Report is 3 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1050      +/-   ##
==========================================
- Coverage   16.33%   16.28%   -0.05%     
==========================================
  Files         112      112              
  Lines       19771    19771              
==========================================
- Hits         3229     3220       -9     
- Misses      16256    16267      +11     
+ Partials      286      284       -2     

Flag	Coverage Δ
unittests	16.28% <ø> (-0.05%)	⬇️

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[mnecas]

lgtm