docker: add new way to build and push docker images,

[Anmol1696]

Closes: #247

New way to build and push docker images.
Create workflow to build and push docker image, add version for each of the docker

[Copilot]

Pull Request Overview

Unifies Docker image builds across postgis, pgvector, and node-sqitch by parameterizing Dockerfiles, introducing per-image version.yaml files, and adding a GitHub Actions workflow to build/push multi-arch images.

• Introduces centralized docker/Makefile to build/push images for multiple processes and versions.
• Parameterizes Dockerfiles with BASE and BASE_VERSION args and adds repository source labels.
• Adds .github/workflows/docker.yaml to build (PRs) and build+push (push/dispatch) images to GHCR.

Reviewed Changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
docker/postgis/version.yaml	Declares base image and versions for postgis build matrix.
docker/postgis/Dockerfile	Parameterized base image; added label; installs packages.
docker/pgvector/version.yaml	Declares base image and versions for pgvector build matrix.
docker/pgvector/Dockerfile	Parameterized base; revised build steps for pgvector extension.
docker/node-sqitch/version.yaml	Declares base image and versions for node-sqitch build matrix.
docker/node-sqitch/Dockerfile	Parameterized base in multi-stage build; added labels.
docker/Makefile	New unified targets to build/push per process and per version from version.yaml.
.github/workflows/docker.yaml	New workflow to build (PR) and build+push (push/dispatch) images to GHCR.

Comments suppressed due to low confidence (1)

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[Copilot]

'\s' is not a valid character class in POSIX/GNU sed; VERSIONS will be empty and the build will fail. Use POSIX classes and allow optional indentation: replace the inner sed with sed -n 's/^[[:space:]]-[[:space:]]//p'.

[Copilot]

Same as above: '\s' is not recognized by sed. Update to sed -n 's/^[[:space:]]-[[:space:]]//p' so version items are parsed correctly.

[Copilot]

[nitpick] YAML list items should be indented under the key; as written many YAML parsers will reject this. Prefer a valid YAML structure and (with the Makefile changes above) allow optional indentation: change to ' - 13.3-alpine'.

Suggested change

	- 13.3-alpine
	- 13.3-alpine

[Copilot]

[nitpick] Indent the list item for valid YAML: ' - 20.12.0-alpine3.19'.

Suggested change

	- 20.12.0-alpine3.19
	- 20.12.0-alpine3.19

[Copilot]

workflow_dispatch inputs (process, version) are defined but unused; this matrix always builds all processes, ignoring the user's selection. Gate the matrix on event type or add a dispatch-specific step/job that uses inputs.process and inputs.version (e.g., run make PROCESS='${{ inputs.process }}' VERSION='${{ inputs.version }}' build-push-process-version for workflow_dispatch).