Add latest lang versions (Python 3.12, Node.js 20, Go 1.21)

src/construct/python3.12-linux-x86_64/Dockerfile

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+FROM python:3.12-alpine
+
+# Copy files common for all images
+COPY 4img/* ./
+
+# Install all dependencies
+RUN ./prepare
+RUN ./prepare-alpine-init && ./prepare-alpine-ruby && ./prepare-alpine-uninit
+
+# Validate that we've got correct version, e.g. something like this:
+#
+# $ python --version
+# Python 3.12.0
+
+RUN ./validate-python '^Python 3\.12\.'
+RUN ./validate-construct '^2\.10\.'

src/construct/python3.12-linux-x86_64/build

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+../../generic-build

src/construct/python3.12-linux-x86_64/run-it

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+../../generic-run-it

src/go/1.21-linux-x86_64/Dockerfile

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+FROM golang:1.21-alpine
+
+# Copy files common for all images
+COPY 4img/* ./
+
+RUN ./prepare-alpine-init
+
+# Ruby is required for test infrastructure (aggregators, test result converters) to work
+RUN ./prepare-alpine-ruby
+
+# Required to download go-junit-report release in ./prepare-go-deps
+RUN apk add curl
+
+# Required for `go get` to work
+RUN apk add git
+
+RUN ./prepare-alpine-uninit
+
+# Install rest of go-specific dependencies
+RUN ./prepare
+
+# Validate that we've got correct version, e.g. something like this:
+#
+# $ go version
+# go version go1.21.3 linux/amd64
+
+RUN ./validate '^go version go1\.21\.'

src/go/1.21-linux-x86_64/build

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+../../generic-build

src/go/1.21-linux-x86_64/run-it

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+../../generic-run-it

src/javascript/nodejs20-linux-x86_64/Dockerfile

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+FROM node:20-alpine
+
+# Copy files common for all images
+COPY 4img/* ./
+
+# Install all dependencies
+RUN ./prepare
+RUN ./prepare-alpine-init && ./prepare-alpine-ruby && ./prepare-alpine-uninit
+
+# Validate that we've got correct version, e.g. something like this:
+#
+# $ node --version
+# v20.8.0
+
+RUN ./validate '^v20\.'

src/javascript/nodejs20-linux-x86_64/build

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+../../generic-build

src/javascript/nodejs20-linux-x86_64/run-it

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+../../generic-run-it

src/python/3.12-linux-x86_64/Dockerfile

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+FROM python:3.12-alpine
+
+# Copy files common for all images
+COPY 4img/* ./
+
+# Install all dependencies
+RUN ./prepare
+RUN ./prepare-alpine-init && ./prepare-alpine-ruby && ./prepare-alpine-uninit
+
+# Validate that we've got correct version, e.g. something like this:
+#
+# $ python --version
+# Python 3.12.0
+
+RUN ./validate '^Python 3\.12\.'

src/python/3.12-linux-x86_64/build

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+../../generic-build

src/python/3.12-linux-x86_64/run-it

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+../../generic-run-it