Publish multi-platform images built on native runners

[tescalada]

The image was built only for the runner's architecture, so every published tag was linux/amd64 and an arm64 host had no manifest to pull — a deploy fails with no matching manifest for linux/arm64/v8.

Each platform now builds on a runner of its own architecture: ubuntu-latest for amd64, ubuntu-24.04-arm for arm64. Same-repo builds push untagged, addressed by digest, and a merge job joins the digests into one manifest list carrying the tags.

Fork PRs cannot push, and the digest merge needs both images in the registry, so they upload one archive per platform instead. publish-pr.yml joins those into a single multi-platform image and pushes it — still without checking out or executing fork code, and still deriving every tag from the API rather than from anything the fork controls.

Nothing is emulated on either path.

[github-actions]

Coverage report

File	Stmts	Miss	Cover	Missing
sparkmeter
__version__.py	16	2	88%	32, 38
_wsgi_mount_smoketest.py	97	97	0%	19–152
app.py	315	11	97%	19–20, 111, 368–375, 552–554, 675, 682–683
asgi.py	74	74	0%	19–166
cli.py	42	6	86%	59–70
cli_app.py	8	8	0%	4–20
cli_prompts.py	15	12	20%	8–12, 17–21, 26–28
conftest.py	181	9	95%	51–52, 85–86, 108–120, 209
controller.py	244	42	83%	183, 207–208, 531, 585–642
debug_memory.py	32	32	0%	6–63
periodic.py	56	31	45%	60–66, 71–75, 80–84, 93–98, 103–111, 124–128
sentry_proxy.py	34	22	35%	38, 44–47, 56–65, 73–82
servercommand.py	112	72	36%	47, 56–60, 64–69, 73–78, 82–85, 89–90, 101–103, 112–181
sparkmeter/alembic/versions
0.32_merge_sms_tables.py	46	3	93%	61–67
0.77_snapshot_support.py	128	2	98%	340, 401
sparkmeter/api
customerviews0.py	283	1	99%	301
historyviews0.py	114	92	19%	49–55, 69–72, 81–131, 144–175, 185–216, 230–257
sparkmeter/config
configparameter.py	57	2	96%	80, 111
sparkmeter/database
alchemy.py	54	4	93%	61–63, 74
database.py	232	3	99%	497, 579–580
ormobject.py	55	1	98%	65
session.py	21	21	0%	12–62
types.py	54	3	94%	91–92, 125
sparkmeter/ground
groundcommand.py	20	10	50%	20–35
sparkmeter/history
historyview.py	35	16	54%	30–31, 41–54, 65–72
sparkmeter/meter
meterdomain.py	772	27	97%	892, 1805–1806, 1817–1868, 1911
sparkmeter/metering
api.py	27	9	67%	66–76
cli.py	227	58	74%	158, 174–175, 184, 193, 198–201, 203, 234, 238–244, 281–297, 301–335, 456–458
dispatch.py	74	16	78%	78–80, 85–97, 185
events.py	105	34	68%	56, 75–77, 109–112, 118–193, 240
lifespan.py	69	52	25%	37–98, 109–125
reconcile.py	113	43	62%	84–107, 119–120, 129, 135–138, 140–143, 169, 259–262, 266–269, 273–276, 287
sparkmeter/metering/tools
cli_client.py	82	58	29%	46–52, 56–61, 65–70, 83–107, 115–148, 153–166
sparkmeter/misc
datetimeutils.py	65	3	95%	115–117
sparkmeter/system
systemcommand.py	67	5	93%	35, 130–132, 134–135
sparkmeter/tariff
tariffcommand.py	82	15	82%	27–44
sparkmeter/transaction
transactionview.py	167	1	99%	71
sparkmeter/user
userdomain.py	187	12	94%	416–434
sparkmeter/web
unittestutils.py	194	11	94%	73–81, 323, 332, 398, 400
views.py	72	1	99%	71
TOTAL	12667	921	93%

Tests	Skipped	Failures	Errors	Time
1277	0 💤	0 ❌	0 🔥	2m 13s ⏱️

[github-actions]

Diff Coverage

Diff: origin/main...HEAD, staged and unstaged changes

No lines with coverage information in this diff.